Significant figures are the meaningful digits in a number that convey its precision. In scientific and technical calculations, the number of significant figures is used to express the level of accuracy of a measurement or calculation.
What is the Number of significant figures?a. 225.0 - 4 significant figures
c. 0.0003210 - 5 significant figures
b. 1000.0 - 4 significant figures
d. 0.0067 - 3 significant figures
e. 1,000,000. - 7 significant figures
f. 2.00001 - 5 significant figures
Rounding to three significant figures:
a. 15.9994 -> 16.0
c. 0.6654 -> 0.67
e. 87,550 -> 87,000
b. 1.0080 -> 1.01
d. 4885 -> 4,900
f. 0.027225 -> 0.0272
Arithmetic operations rounded to the appropriate number of significant figures or decimal places:
a. 77.981 x 2.33 = 182.0 (3 significant figures)
b. 4 x 0.0665 = 0.266 (3 significant figures)
c. 17.344.900 + 23.1 = 17.345 million (1 decimal place)
d. 9.80 - 4.762 = 5.038 (3 significant figures)
e. 3.9 x 6.05 x 420 = 9,658 (3 significant figures)
f. 14.1 / 5 = 2.82 (3 significant figures)
g. 1001 + 16.23 = 1017 (3 significant figures)
h. 424.5 + 2.8461 = 427.3 (3 significant figures)
i. 9.9 - 9.54 = 0.36 (2 significant figures)
j. 7.3778 - 0.000265 = 7.378 (4 significant figures)
k. (24.358)(6.4) = 155 (2 significant figures)
l. (48.6)(0.6959) = 33.7 (2 significant figures)
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An aqueous NaCl solution is made using 129 g of NaCl diluted to a total solution volume of 1.15 L. What is the molality of the solution. ( Assume a density of 1.08mL for the solution.) And what is the mass percent of the solution.
The mass of the solution is 1.24 Kg. Number of moles of NaCl solute is 2.20. Then the molality of the solution is 1.98 molal. The mass percent of the solute is 10.3 %.
What is molality ?Molality is a term used to express the concentration of a solution. It is the ratio of number of moles of solute to the mass of solvent in kg.
Given the weight of NaCl = 129 g
molar mass = 58.5 g/mol
number of moles = 129/58.5 = 2.20 moles.
Density of solution = 1.08 g/ml
volume of solution = 1150 ml
then mass of solution = volume × density = 1150 ×1.08 = 1242 g.
mass of solvent = 1242 -129 = 1113 g = 1.11 Kg.
molality of the solution = 2.2 moles/1.1 Kg = 1.98 molal.
Mass percent of the solution = mass of solute/total mass × 100
mass % = 129 g / 1242 g × 100 = 10.3 %.
Hence, mass percent of the solution is 10.3 %.
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How do you convert kJ to Cal
The units are kilojoules and calorie are used to express the energy o a system. One kJ is 0.239 cal. Using this relation, we can convert kJ to calorie.
What is one kJ of energy ?Energy of a system is equivalent to the work done on the system or by the system using a force applied. The SI unit of work and energy is joule (J). One J of energy is the basic unit.
1000 joules = one kilojoule.
Other units of energy are, calorie, erg etc. The relation between one kJ and calorie unit is:
1 kJ = 0.239 calories.
Using this relation we can interconvert these two units.
For example, 20 KJ of energy is converted to calories as:
20 kJ × 0.239 cal / 1 kJ = 4.78 calories.
Therefore, kJ of energy can be converted to cal by multiplying with 0.239.
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What is the density of nitrogen gas at 67.3 °C and 0.288 atm?
The density of nitrogen gas at 67.3 °C and 0.288 atm is approximately 0.0147 g/L.
What is nitrogen gas used for?
Nitrogen are commonly used during sample preparation in chemical analysis and It also used to concentrate and reduce the volume of liquid sample.
The density of a gas can be calculated using the Ideal Gas Law:
PV = nRT
where P is the pressure, V is the volume n is the number of moles R is the gas constant (8.31 J/molK)T is the temperature in Kelvin.We can rearrange the equation to solve for the volume:
V = nRT / P
And then use the density formula:
density = mass / volume = m / V
where m is the mass of the gas and V is the volume.
Since the moles and the mass of a gas are related by its molecular weight (m = n * MW), we can substitute n * MW for m:
density = (n * MW) / V
Plugging in the values we get:
density = (n * 28.01) / (RT / P)
density = (n * 28.01 g/mol) / ((8.31 J/molK * (67.3 + 273.15 K)) / 0.288 atm)
density = (n * 28.01 g/mol) / (547.57 J/mol / 0.288 atm)
density = (n * 28.01 g/mol) / (1915.69 J/mol / atm)
density = (n * 28.01 g/mol) * (1 atm / 1915.69 J/mol)
density = 0.0147 g/L
Therefore, The density of nitrogen gas at 67.3 °C and 0.288 atm is approximately 0.0147 g/L.
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The density of the Nitrogen gas is 0.29 g/mol.
What is the Ideal gas law?The Ideal gas law is a scientific equation that describes the behavior of an ideal gas, a theoretical gas made up of a large number of particles that do not interact with each other. The Ideal gas law states that the pressure, volume, and temperature of an ideal gas are directly proportional to each other.
Using the formula;
d = MP/RT
Density = d
Molar mass of the gas = M
Gas constant = R
Temperature = T
d= 28 g/mol * 0.288/0.082 * 340.3
d = 8.06/27.9
d = 0.29 g/mol
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Put the following objects in order to of increasing kinetic molecular energy.
helium balloons
hot coffee
slime
limestone
Answer:
limestone < slime < hot coffee < helium balloons
Explanation:
The order is based on the average kinetic energy of the particles in each object. The order increases as the temperature of the object increases, causing the particles to move faster and have more kinetic energy.
1. Limestone: Solid-state mineral with relatively low temperature and slow-moving particles, lowest kinetic energy among the objects listed.
2. Slime: A non-Newtonian fluid that can be considered as a soft solid, its particles have more kinetic energy than solid limestone, but less than a liquid like hot coffee.
3. Hot Coffee: A liquid with a higher temperature than the other objects, particles have more kinetic energy compared to solid or non-Newtonian fluid.
4. Helium Balloons: Gas with a higher temperature than the other objects, particles have the highest kinetic energy among the objects listed, resulting in the balloon expanding and rising.
what is the name of proper organic molecules.?
Carbohydrates, lipids, proteins, and nucleic acids are the 4 types of organic molecules.
What is the name of organic molecules?The simplest organic compounds are hydrocarbons, which carry only carbon and hydrogen. Alkanes contain hardly carbon–hydrogen and carbon–carbon single bonds, alkenes hold at least one carbon–carbon double bond, and alkynes contain molecules with one or more carbon–carbon triple bonds.
Four main classes of organic molecules—carbohydrates, lipids, proteins, and nucleic acids—are debated in the following sections. Examples of organic molecules are hydrocarbons, aliphatic amalgam, aromatic and alicyclic compounds, polymers, biomolecules, and buckyballs. collate inorganic molecules.
So we can conclude that organic compounds are carbohydrates, fats (lipids), proteins, and nucleic acids.
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A volcano that has not erupted for thousands of years and probably will not erupt again is called an extinct volcano.
Answer:
B- Active volcano
Explanation:
The star Sirius is the brightest in the night sky, and it has a radius of 1.191 million kilometers. The closest star system to Earth is Alpha Centauri, and it consists of three stars. They appear to our eye as a single star. The largest star in this system is Alpha Centauri A, which has a radius of 1.227 solar radii. Which star has the larger radius?
The largest star in the Alpha Centauri system, Alpha Centauri A, has a larger radius than Sirius.
How to determine a larger star?Alpha Centauri A has a radius of 1.227 solar radii, while Sirius has a radius of 1.191 million kilometers. To compare the two, convert Sirius' radius to solar radii. To do this, use the known radius of the Sun, which is approximately 696,000 kilometers.
Thus, Sirius' radius can be expressed as 1.191 million kilometers / 696,000 kilometers = 1.72 solar radii.
Therefore, Alpha Centauri A has a larger radius than Sirius, with 1.227 solar radii > 1.72 solar radii.
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copper exists as a mixture of 2 isotopes, 70.5% Cu-63, with a mass of 62.96 amu, and 29.5% Cu-65, with a mass of 64.96 amu. what is the average atomic weight?
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the average atomic mass of copper is 63.55amu.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)
Substituting the given values, we get
Average atomic mass=( 62.96 amu × 70.5% )+(64.96 amu ×29.5% )
Average atomic mass=55.58+12.27
Average atomic mass=63.55amu
Therefore, the average atomic mass of copper is 63.55amu.
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Daniel combined some substances. He made a list of the substance he combined. Which combination is a solution?
Water and salt is a correct combination. Therefore, the correct option is option A among all the given options.
What is chemical reaction?Chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.
Chemical reactions are a fundamental component of life itself, as well as technology and culture. Burning fuels, melting iron, creating glass as well as pottery, brewing beer, producing wine, and making cheese are just a few examples of ancient processes that involved chemical reactions. Water and salt is a correct combination.
Therefore, the correct option is option A.
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Can you help me solve number 3 ? Thank you
what is the name of proper organic molecules
What conditions are needed to prevent iron from rusting?
Answer:
keep the object away from moisture.
Explanation:
What is the density of fluorine gas at 354 K and 1.26 atm?
The density of the gas is 1.65 g/L.
What is the density of the gas?We know that in this case that we would need to use the ideal gas equation and this is the one that would deal with the pressure and the density of the gas and the formula that is to be used is the one that saya that;
d =MP/RT
M = molar mass of the gas
P = pressure of the gas
P = pressure of the gas
R = gas constant
T = temperature of the gas
We would then have that;
d = 38 * 1.26/0.082 * 354
= 1.65 g/L
The gas would have a density of about 1.65 g/L.
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How many atoms of K and N must be present in the compound formula
From the formula of the compound;
the number of atoms of K is 18.06 * 10²⁴ atoms of Kthe number of atoms of N present is 6.02 * 10²³ atoms of N.What is the formula of the compound from potassium, K, and nitrogen, N?The formula of the compound from potassium, K, and nitrogen, N is K₃N.
The formula of the compound is K₃N because K has a valency of 1 while N has a valency of 3.
From the formula of the compound, the number of moles of atoms of K present is 3 moles of atoms.
The number of atoms of K will then be 3 * 6.02 * 10²³ = 18.06 * 10²⁴ atoms of K
From the formula of the compound, the number of moles of atoms of N present is 1 mole of atoms.
The number of atoms of N will then be 1 * 6.02 * 10²³ = 6.02 * 10²³ atoms of N.
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Sulfur trioxide reacts with water to form sulfuric acid according to the following reaction: SO₃ + H₂O → H₂SO₄ Given the atomic mass of hydrogen is 1 amu, the atomic mass of oxygen is 16 amu, and one molecule of sulfuric acid has a mass of 98 amu, what is the atomic mass of sulfur trioxide?
Explanation:
The atomic mass of sulfur trioxide can be calculated as follows:
1 molecule of sulfuric acid has a mass of 98 amu, and it is composed of 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms. So, the mass of hydrogen and oxygen atoms in 1 molecule of sulfuric acid is (2 * 1 amu) + (4 * 16 amu) = 34 amu.
Therefore, the mass of sulfur in 1 molecule of sulfuric acid is 98 amu - 34 amu = 64 amu.
Since 1 molecule of sulfuric acid is formed from 1 molecule of sulfur trioxide, the atomic mass of sulfur trioxide can be calculated as 64 amu.
Sulfur trioxide reacts with water to form sulfuric acid according to the following reaction: SO₃ + H₂O → H₂SO₄ Given the atomic mass of hydrogen is 1 amu, the atomic mass of oxygen is 16 amu, and one molecule of sulfuric acid has a mass of 98 amu, the atomic mass of sulfur trioxide is 80 amu.
According to the law of conservation of mass, in a reaction, atomic mass of the reactants will be equal to atomic mass of the products if the reaction is balanced and above reaction is balanced. Hence,
Mass of SO₃ + Mass of H₂O = Mass of H₂SO₄
x + 18 = 98
x = 80 amu = Mass of SO₃
Therefore, when Sulfur trioxide reacts with water to form sulfuric acid according to the following reaction: SO₃ + H₂O → H₂SO₄ Given the atomic mass of hydrogen is 1 amu, the atomic mass of oxygen is 16 amu, and one molecule of sulfuric acid has a mass of 98 amu, the atomic mass of sulfur trioxide is 80 amu.
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How many atoms of titanium are there in 0.770 mole of each of the following?
ilmenite, FeTiO3 ____ Ti atoms
titanium(IV) chloride ______ Ti atoms
Ti2O3 _____ Ti atoms
Ti3O5 ______ Ti atoms
ilmenite, FeTiO3: 0.770 mole * (1 Ti atom / (1 FeTiO3 formula unit)) * (1 FeTiO3 formula unit / 3 Ti atoms) = 0.770 mole * (1/3) = 0.257 mole of Ti atoms.
titanium(IV) chloride, TiCl4: 0.770 mole * (1 Ti atom / (1 TiCl4 formula unit)) * (1 TiCl4 formula unit / 1 Ti atom) = 0.770 mole of Ti atoms.
Ti2O3: 0.770 mole * (2 Ti atoms / (1 Ti2O3 formula unit)) * (1 Ti2O3 formula unit / 2 Ti atoms) = 0.770 mole of Ti atoms.
Ti3O5: 0.770 mole * (3 Ti atoms / (1 Ti3O5 formula unit)) * (1 Ti3O5 formula unit / 3 Ti atoms) = 0.770 mole of Ti atoms.
What is atom?An atom is the smallest unit of matter that retains the chemical properties of an element. It consists of a central nucleus made up of protons and neutrons, surrounded by electrons in orbit. The number of protons in the nucleus of an atom determines what element the atom is.
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what are the colors of a rainbow
What is the name of the bond between two amino acids called? What type of chemical reaction is necessary to make this bond?
The bond that holds the amino acids is called the peptide bond and the bond is formed by the reaction between the -COOH group and the -NH2 group.
What are amino acids?The amino acids are the compounds that can be formed by the reaction of the carbonyl group of the acid and the amide group.
Amino acids are the building blocks of proteins. They are organic compounds containing both a carboxyl (-COOH) and an amino (-NH2) group, as well as a unique side chain (R group) specific to each amino acid.
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Select the correct answer. Which statement is true for a heating curve? A. It shows how the pressure of a substance changes when heated. B. It shows how the temperature of a substance changes when heated. C. It shows how the volume of a substance changes when heated. D. It shows how the mass of a substance changes when heated.
The statement which is true for a heating curve is that it shows how the temperature of a substance changes when heated and is therefore denoted as option B.
What is Temperature?This is referred to as the degree of hotness or coldness of a substance and it is influenced by thermal energy with its unit being kelvin.
Heating curve on the other hand is a type of graph which shows the manner in which the temperature of a substance changes when heated as a result if the values being depicted and is therefore the reason why option B was chosen.
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container a holds 717mL of an ideal gas at 2.90atm. container b holds 159mL of a different ideal gas at 4.30atm. if the gases are allowed to mix together, what is the resulting pressure?
H3PO4 + Ca(OH)2 ----> H2O + Ca3(PO4)2 If 10.3g of Ca(OH)2 reacts , How much water is made
Taking into account the reaction stoichiometry, if 10.3 g of Ca(OH)₂ reacts, 5.01 grams of H₂O are formed.
Reaction stoichiometryThe balanced reaction is:
2 H₃PO₄ + 3 Ca(OH)₂ → 6 H₂O + Ca₃(PO₄)₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₃PO₄: 2 molesCa(OH)₂: 3 molesH₂O: 6 molesCa₃(PO₄)₂: 1 moleThe molar mass of the compounds is:
H₃PO₄: 98 g/moleCa(OH)₂: 74 g/moleH₂O: 18 g/moleCa₃(PO₄)₂: 310 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
H₃PO₄: 2 moles ×98 g/mole= 196 gramsCa(OH)₂: 3 moles ×74 g/mole= 222 gramsH₂O: 6 moles ×18 g/mole= 108 gramsCa₃(PO₄)₂: 1 mole ×310 g/mole= 310 gramsMass of water formedThe following rule of three can be applied: if by reaction stoichiometry 222 grams of Ca(OH)₂ form 108 grams of H₂O, 10.3 grams of Ca(OH)₂ form how much mass of H₂O?
mass of H₂O= (10.3 grams of Ca(OH)₂ ×108 grams of H₂O)÷ 222 grams of Ca(OH)₂
mass of H₂O= 5.01 grams
Finally, 5.01 grams of H₂O are formed.
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How many calcium ions are there in 4.13 g of CaCO3?
0.248 gram of calcium ions are there in 4.13 g of CaCO3.
What do you mean by mole ?The term mole is defined as the amount of substance of a system which contains as many elementary entities.
1 mole is equal to 6.023 × 10 ²³ molecules.
One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.
1 mole of any molecule = 6.023 × 10²³ molecules
1 mole of calcium ion = 6.023 × 10²³ molecules
Molar mass of CaCO3 = 1oogram / mole
Therefore, 4.13 g of CaCO3 of = 4.13 / 100 × 6.023 × 10²³
= 0.248 gram
Thus, 0.248 gram of calcium ions are there in 4.13 g of CaCO3.
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Help!!⚠️
Oxygen-16: number of protons, number of neutrons, mass number
Oxygen-17: number of protons, number of neutrons, mass number
Oxygen-18: number of protons, number of neutrons, mass number
Answer:
Oxygen-16 has 8 protons and 8 neutrons, and a mass number of 16. Oxygen-17 has 8 protons and 9 neutrons, and a mass number of 17. Oxygen-18 has 8 protons and 10 neutrons, and a mass number of 18.
Explanation:
Fill in the correct conversions for the following temperatures:
298 K =________ °C
________ K = 5°C
335 K =_______ °C
30 points
Answer:
To convert from Kelvin to Celsius, subtract 273 and vice versa to convert from Celsius to Kelvin.
Therefore:
298K - 273 = 24 °C
5°C + 273 = 278K
335K - 273 = 62°C
47. If the molar mass of X(HCO3)2 is 162 g mol-¹, determine the relative atomic mass of X. [H=1.0, C = 12.0. O = 16.0] A. B. C. D. 40 48 61 101 please answer with step by step solution
Answer:
X(HCO3)2 is X2(C2H2O6), so the total number of atoms for each element can be calculated:
2 X atoms
4 H atoms
6 C atoms
12 O atoms
Calculate the total atomic mass of the elements:
2 X atoms * atomic mass of X = 2X * atomic mass of X
4 H atoms * 1.0 amu = 4.0 amu
6 C atoms * 12.0 amu = 72.0 amu
12 O atoms * 16.0 amu = 192.0 amu
The molar mass of X(HCO3)2 is 162 g/mol, so the total atomic mass of the elements should add up to 162 g/mol:
2X * atomic mass of X + 4.0 amu + 72.0 amu + 192.0 amu = 162 g/mol
Solve for X by rearranging the equation:
2X * atomic mass of X = 162 g/mol - 4.0 amu - 72.0 amu - 192.0 amu = -12.0 amu
2X = -12.0 amu / atomic mass of X
Divide both sides by 2:
X = -6.0 amu / atomic mass of X
So the relative atomic mass of X is 6.0 amu.
An experiment is set up with a glass bottle and a candle. The starting volume of the bottle is 250 mL at a pressure of 1 atm. The bottle contains 0.00600 moles of O2 gas. A candle is then put into the bottle and the flame consumes most of the oxygen. The temperature is 70°C. After the candle goes out, there is only 0.000540 moles of oxygen remaining and the temperature drops to 35°C. Assume the volume is still 250 mL. What is the pressure inside the bottle?
________atm (use 3 sig figs with one zero in front of the decimal)
30 points
Answer: 0.112 atm.
Explanation:
(PV = nRT), which states that the pressure times volume of a gas is equal to the number of moles of gas times the ideal gas constant times the temperature.
Since the volume of the bottle is constant, we can rearrange the Ideal Gas Law to solve for pressure:
P = (nRT) / V
where
n = 0.000540 moles (the amount of O2 remaining after the candle goes out)
R = 8.31 J/mol*K (the ideal gas constant)
T = 35 + 273 = 308 K (the temperature in kelvins)
V = 250 mL = 0.25 L (the volume of the bottle in liters)
Plugging in the values, we get:
P = (0.000540 * 8.31 * 308) / 0.25
P = 0.112 atm
So, the pressure inside the bottle after the candle goes out is approximately 0.112 atm.
Which of the following statements describes the cause of ice ages
What causes the changes in the ice ages is when the earth's orbits tilts.
What is the cause of the ice ages?
The ice ages are caused by changes in Earth's orbit and tilt, which affect the amount of solar radiation received by the planet. These changes alter the climate and trigger the growth and retreat of ice sheets.
We know that the changes in the climates is responsible for most of the changes that we can see in the universe as we have come to experience it today.
Thus the earth's orbits is what does control the changes in the ice ages.
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Assume that each tablets mass was 1,000 mg and remember that you used 0.200 L of water each time. Compute the reaction rate to the nearest whole number using the formula below
The reaction rate to the nearest whole number is 352 mg/L/sec. Reaction rate is the pace at which an chemical process moves forward.
What is reaction rate?Reaction rate is the pace at which an chemical process moves forward. It is frequently described in terms either of the amount of a reactant that's also consumed in a time unit or the intensity of a product that is generated in a unit of time (amount per unit volume). You may also describe it in terms of how much of the reactants are used up or how much of the products are produced in a certain length of time.
at 3°C
Reaction rate = (1000/0.2)/138.5 = 36 mg/L/sec
at 24°C
Reaction rate = (1000/0.2)/34.2 = 146 mg/L/sec
at 40°C
Reaction rate = (1000/0.2)/26.3 = 190 mg/L/sec
at 65°C
Reaction rate = (1000/0.2)/14.2 = 352 mg/L/sec
Therefore, the reaction rate to the nearest whole number is 352 mg/L/sec.
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Answer:
see below
Explanation:
3°C: 36
24°C: 146
40°C: 190
65°C: 352
Full table: 145
Eight pieces: 173
Tiny pieces: 216
Use the chemical equation to answer the question. 4K(s) + O₂(g) → 2K₂O(s) The molar mass of potassium (K) is 39 g/mol. The molar mass of oxygen (O) is 16 g/mol. How many grams of potassium are needed in the reaction to produce 23.5 grams of potassium oxide (K₂O)?
As per the balanced reaction, 4 moles or 156 g of potassium produces 2 moles or 188 g of K₂O. Hence, the mass of K required to produce 23.5 g of K₂O is 19.5 g.
What is potassium superoxide.Alkali metals such as sodium and potassium forms superoxide having the general formula, M₂O. These metals easily reacts with atmospheric oxygen forms their oxides.
The given reaction shows that, 4 moles of K gives 2 moles of K₂O.
atomic mass of K = 39 g/mol
mass of 4 K = 4 × 39 = 156 g
molar mass of K₂O = 94 g
mass of 2 moles = 188 g.
Hence, 156 g of K gives 188 g of potassium oxide. Thus, mass of K required to produce 23.5 g is:
(23.5 × 156)/188 = 19.5 g.
Therefore, 19.5 g of potassium metal is required to produce 23.5 g of K₂O.
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If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ∘C
) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/mol
and a heat capacity for iron of 0.449 J/(g⋅∘C)
.)
Answer: sweet home
Explanation: