Answer:
a) Number of moles = 0.41 mol
b) Number of moles = 0.44 mol
c) Number of moles = 0.47 mol
Explanation:
a)
Given data:
Mass of copper sulfate = 65.5 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass of copper sulfate = 159.6 g/mol
Number of moles = 65.5 g/ 159.6 g/mol
Number of moles = 0.41 mol
b)
Given data:
Mass of magnesium nitrate = 65.5 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass of magnesium nitrate = 148.3 g/mol
Number of moles = 65.5 g/148.3g/mol
Number of moles = 0.44 mol
c)
Given data:
Mass of potassium carbonate = 65.5 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass of potassium carbonate = 138.2 g/mol
Number of moles = 65.5 g/138.2g/mol
Number of moles = 0.47 mol
29.
How many seconds would it take for the total pressure to be 0.7133 atm?
Group 17 is called the halogen family, and the group to its right is called the noble gases. How are the elements in these groups alike and how are they different?
Answer: they all have 7 electrons they have different atom sizes
Explanation: hope it helps
Help would be greatly appreciated, thank you!! :) What is the relationship between Pressure (P) and Volume (V)?
1. Inversely proportional
2. Directly proportional
3. There is no relationship
BRAINLIEST!!!HELPPPP MEEEE!!!
A researcher investigates the solubility of a new compound in water. Which action would best validate the data collected for the solubility of the new compound?
repeatedly testing the solubility at various temperatures
having a science expert measure the solubility
measuring the solubility of other substances
studying other properties of the compound
Answer:
I think the answer is A) repeatedly testing the solubility at various temperatures
Explanation:
which element has very high reactivity , very good electrical conductivity , and good malleability
Answer: radiation
Explanation: im not sure so dont take my word fot it
nitrogen gas expands isothermally from 10cm3 to 25 cm3 the initial pressure is 2.0 x 105 Pa
The process of DNA copying itself begins when the two sides of the DNA molecule unwind and separate. True or False
Answer: False
Explanation: False. Replication. The process of DNA copying itself begins when the two sides of the DNA molecule unwind and " separate ".
4 NH3 + 5 O2 - 4 NO + 6 H20
Given 20 moles of O2 and 14 moles of NH3, which would act as the limiting reactant?
NH₃ as the limiting reactant
Further explanationGiven
Reaction
4 NH3 + 5 O2 ⇒ 4 NO + 6 H20
Required
The limiting reactant
Solution
To find the limiting of the reactants, we can use the method by dividing the moles of each reactant by the reaction coefficient. The smallest ratio will be the limiting reactants
the mol ratio of NH₃ : O₂ =
=14/4 : 20/5
= 3.5 : 4
So NH₃ as the limiting reactant
Find the mass of 5.82 mol of MgCl2. Round to the nearest tenth.
Answer:
554.13 grams
Explanation:
The mass of 5.82 mol of MgCl2 is 552.9g. Details about how to calculate mass can be found below.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.
According to this question, there are 5.82 moles of MgCl2. The mass is calculated thus:
molar mass of MgCl2 = 24 + 35.5(2) = 95g/mol
mass of MgCl2 = 95g/mol × 5.82 moles
mass of MgCl2 = 552.9g
Therefore, the mass of 5.82 mol of MgCl2 is 552.9g.
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What is the poisonous gas released by incomplete combustion(the name not formula)
Answer:
CARBON MONOXIDE
Explanation:
Carbon monoxide is produced by incomplete combustion of hydrocarbon fuels. Poisoning by carbon monoxide is caused by operating improperly vented space heaters or furnaces in poorly ventilated buildings.
If 250J of energy from the Sun hits the
atmosphere at a certain place, but only 128J
makes it to the surface of the Earth, how much
energy is reflected by the atmosphere?
Predict the outcome of this reaction. Balancing doesn't matter.
Mg + H2O -->
Answer:
MgO + H₂
Explanation:
The products of reaction is MgO and hydrogen gas.
This is a single displacement reaction.
In this reaction, the possibility of the reaction is determined by position of the atoms on the activity series.
Mg is higher than H on the activity series, so it is more reactive and it then displaces the hydrogen in water;
Mg + H₂O → MgO + H₂
Please help brainliest ! And if not PLEASE give correct answer.
Drag each description to the correct location on the image. Not all descriptions will be used. Describe the layers of the Sun.
Answer:
1. Where the sun's energy is produced.
Explanation:
2. Region that energy moves through radiation
3. Hot gases move up and cool gases sink down.
4. Appears as a red ring around the sun.
I really hope this helps :)
Eplain why placing the rock in the water causes the water level to rise.
Answer:
Increase of pressure
Explanation:
When the rock is placed in the water is adds pressure into the water causing it to rise.
How many moles of oxygen will occupy a volume of 2.5 liters at 1.2 atm
and 25°C? C°C +273 = °K) (R=0.0821 L.atm/mol-K)
We are given:_______________________________________________
Volume of Gas (V) = 2.5L
Pressure (P) = 1.2 atm
Temperature (T) = 25°C OR 25+273 = 298 K
Universal Gravitational Constant (R) = 0.0821
Solving for number of moles:___________________________________
From the Ideal Gas Equation,
PV = nRT
(1.2)(2.5) = n(0.0821)(298) [plugging the given values]
n = [(1.2)(2.5)] / [0.0821*298]
n = 300 / [298*8.21]
n = 0.12 moles
Hence, there are 0.12 moles of Oxygen in 2.5L of 1.2 atm gas when the temperature is 25°C
What type of chemical reaction is 6, 7 and 8
Answer:
Explanation:
Types of Chemical Reactions - Double Displacement Reactions.
Describe how the functions of the digestive and circulatory system are connected.
Answer:
(1) Digestive System gets nutrients (good) from food and hands it over to the blood and Circulatory System then carries those nutrients where they need to go. (2) Filters out waste from food and pushes it through intestines and out the body (and you know how and where it gets out).
8. Fill in the blanks underneath the wave spectrum to indicate the relative positions of each type of
electromagnetic radiation from the given word bank.
gamma
ultraviolet
visible
X-rays
microwaves
infrared
radio/tv
wwwwww
annu
WNNNNN
The order of the radiations from longer wavelength to shorter wavelength is as follows: Radio waves , microwave, infrared, visible light, ultraviolet, X-rays and gamma rays. In these order the blanks have to be filled.
What is electromagnetic spectrum?Electromagnetic spectrum is the arrangement of radiations in the order of decreasing wavelength or increasing frequency. Frequency is the number of wave cycles per unit time.
All the electromagnetic radiations are transverse waves. Wavelength of an electromagnetic radiation is the distance between two consecutive crests or troughs or the waves.
As the wavelength increases frequency and energy of electromagnetic radiations decreases. The longest wave is radio waves.Shortest wave is gamma rays.
The given image of wave is from longer wavelength to shorter wavelength hence the radiations can be arranged as : Radio waves , microwave, infrared, visible light, ultraviolet, X-rays and gamma rays.
To find more on electromagnetic radiation, refer here:
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How many moles of sucrose
are in 5.25x1029 sucrose
molecules?
Answer:
872093.02moles
Explanation:
Given parameters:
Number of atoms of Sucrose = 5.25 x 10²⁹atoms
Unknown:
Number of moles = ?
Solution:
To solve this problem, we must understand that a mole of any substance contains the Avogadro's number of particles.
6.02 x 10²³ atoms makes up 1 mole of an atom
5.25 x 10²⁹ atoms will contain = [tex]\frac{5.25 x 10^{29} }{6.02 x 10^{23} }[/tex] = 872093.02moles
According to the chart below, which element makes up a large portion of the
atmosphere and living matter, but NOT the ocean? (6.58, 6.2E)
Earth Component Elemental Composition
Earth's Crust
O, SI, AI, Fe
Atmosphere
NO
#ocean
H, O, CI, Na
Organic Material
H, O, N, C
A. Oxygen (0)
B. Hydrogen (H)
c. Nitrogen (N)
D. Sodium (Na)
Answer:
B. Hydrogen (H)
c. Nitrogen (N)
D. Sodium (Na)
Explanation:
Answer:
This question is all sorts of messed up but i'm pretty sure I figured it out and its
A
Explanation:
what produces carbon dioxide?
Help me balance the equation
Answer:
blank 1 ----> 1
blank 2 -----> 1
blank 3 ------> 3
Explanation:
easy one!
is acid rain corroding a statue an example of physical weathering
Answer:
Acid rain's effect on stone is a chemical change.
Explanation:
Acid rain has hydrochloric acid which reacts with the calcium carbonate in the stone.
I hope this helps. (Sorry if i am wrong)
The class of drug that increases the activity of the central nervous system is known as:
A. stimulants
B. narcotics
C. hallucinogens
D. depressants
Answer:
A. stimulants
Explanation:
How many atoms of Ba would be equal to 11.3 g of Ba?
Answer:
4.96 x 10²²atoms
Explanation:
Given parameters
Mass of Ba = 11.3g
Unknown:
Number of atoms = ?
Solution:
To solve this problem, we need to find the number of moles of Ba first and then the number of atoms it contains.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Ba = 137.3g/mol
Number of moles = [tex]\frac{11.3}{137.3}[/tex] = 0.08mole
1 mole of a substance contains 6.02 x 10²³ atoms
0.08 mole of Ba will contain 0.08 x 6.02 x 10²³ atoms = 4.96 x 10²²atoms
3. Hydrogen gas was cooled from 150°C to 50 °C. Its new volume is 75.0mL.
What was its original volume?
Answer:98
Explanation:X/423 = 75.0/323 X = 98
Considering the Charles' Law, the original volume is 98.22 mL.
Charles' LawCharles' Law consists of the relationship that exists between the volume and the temperature of a certain amount of ideal gas, which is maintained at a constant pressure.
This law states that for a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of movement that they have. the gas molecules. That is, the volume is directly proportional to the temperature of the gas.
Mathematically, Charles' law states that the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T}=k[/tex]
Considering an initial state 1 and a final state 2, the following is true:
[tex]\frac{V1}{T1}=\frac{V2}{T2}[/tex]
Original volume in this caseIn this case, you know:
V1= ?T1= 150 °C= 423 K (being 0 °C= 273 K)V2= 75 mLT2= 50 °C= 323 KReplacing in Charles's law:
[tex]\frac{V1}{423 K}=\frac{75 mL}{323 K}[/tex]
Solving:
[tex]V1=\frac{75 mL}{323 K}423 K[/tex]
V1= 98.22 mL
In summary, the original volume is 98.22 mL.
Learn more about Charles's law:
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Many geologic features are associated with various plate boundaries. Select each
plate boundary associated with a trench.
Oceanic-Oceanic Convergence
Hot Spot
Divergent Boundary
Oceanic-Continental Convergence
Continental-Continental Convergence
Answer:
subduction zone
Island Arc volcanoes
earthquakes
Find the empirical formula for a compound with 92.25 % Cand 7.75 % H.
Please help. I’m really struggling. No wrong answers please, if you don’t know it please don’t answer, I’m already failing the class.
Answer:CH
Explanation:it’s simply has the answer in the question. It’s just throwing you off with the percentages.
What does the atomic number represents
the number of protons in the nucleus in an atom
Answer:
the atomic number represents the number of protons an atom has.
The molecular formula for the structure show below is:
1. CF
2. CF2
3. CF3
4. CF4
Answer:
CF₄
Explanation:
The molecular formula of the structure shown by the representation is given as:
CF₄
The central atom is C and it is surrounded by 4 atoms of Fluorine.
This structure exhibits covalent bonding between the atoms. To attain a complete octet, the carbon and fluorine share electrons. This sharing of electrons makes them isoelectronic with corresponding noble gases.