Explanation:
First find the mass of 1 mole of water (Molecular mass)
[tex] H_{2} O = 2H + O [/tex]
[tex]
= 2(1) + 32 [/tex]
[tex]
= 34 \: grams
[/tex]
Hence 1 mole of water is 34 g
Compare
1 mole = 34 g
1.33 mole = x g
[tex] \frac{x}{34} = \frac{1.33}{1} [/tex]
[tex]
x = 1.33 \times 34 [/tex]
[tex]
\color{blue}{\boxed{x = 45.2}} \: \: \: \: to \: 3 \: s.f.
[/tex]
Therefore 1.33 moles of water is 45.2 grams
The mass of the substances can be given by the molar mass and the moles of the substances. The mass of 1.33 mole of water is expressed in grams as, 23.94 grams.
What is mass?The mass has been defined as the product of the moles of the substance and the molar mass in grams per mole. The mass is given in grams and has a formula,
Moles = mass ÷ molar mass
Mass = molar mass × moles
Given,
Moles = 1.33 moles
Molar mass of water (H₂O) is calculated as = 2 (1) + 16= 18 grams per mole
Using the formula of mole, mass is calculated as:
Mass = molar mass × moles
mass = 1.33 × 18
= 23.94 grams
The mass of the substance can be calculated if the value of the molar mass and the moles of the substance has been known. The molar mass of the substance can be calculated by adding the mass of the individual masses of the element in a molecule.
Therefore, 1.33 mol of water contains 23.94 grams.
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Frank has a sample of steel that weighs 80 grams. If the density of his sample of steel is 8 g/cm3, what is the sample’s volume? The sample’s volume is cm3.
Answer:
The volume of the steel is 10cm3
Explanation:
Density is defined as the mass contained per unit volume.
Density= Mass
volume
Given : Mass of steel = 80 grams
Density of steel = 8g/cm3
Putting in the values we get:
8g/cm3 = 80g
Volume
Volume=80/8
=10
Thus the volume of steel is 10cm3
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the volume of sample of steel is 10cm³ if the density of his sample of steel is 8 g/cm³.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically, the formula for density can be given as
Density = Mass of the metal ÷volume marked on the graduated cylinder
Mass of steel = 80 grams
Density of steel = 8g/cm³
substituting all the given values in the above equation, we get
Volume of steel=80/8
On calculations, we get
Volume of steel =10cm³
Therefore, the volume of sample of steel is 10cm³.
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In order to survive, plants absorb sunlight, water, and nutrients from the soil. 1. Does this represent a physical or chemical change? 2. Justify why this is this type of change. What property is this?
Could somebody please help this is really hard
Answer:
The answers to your questions are given below
Explanation:
1. 3 Na2SO4
Molecules of Na2SO4 = 3
Na (sodium) = 3 x 2 = 6
S (sulphur) = 3 x 1 = 3
O (oxygen) = 3 x 4 = 12
2. 4 Pb(NO3)2
Molecules of Pb(NO3)2 = 2
Pb (lead) = 4 x 1 = 4
N (nitrogen) = 4 x 2 x 1 = 8
O (oxygen) = 4 x 3 x 2 = 24
What is the shape of s-subshell?
Thus, the s subshell may contain only one orbital and the p subshell may contain three orbitals. Each orbital has its own distinct shape. An s orbital found in a s subshell is spherical, p orbitals found in p subshells are two-lobed, and d orbitals found in d subshells are four-lobed.
Answer:
The s-subshell may contain only one orbit and the p-subshell may contain three orbits . Each orbit has it own distinct shape
May this helps you
Which statement accurately describes the universe?
Answer: The universe consists of all the energy made by the Sun and stars. The universe consists of all physical objects on Earth and in space. The universe consists of all matter and energy. The universe consists of solar systems which contain galaxies.
Explanation: That's because the Universe does consists of all the energy made by the Sun and Stars. That is how we get our energy is from the Sun and Stars, and the Solar System contains Galaxies.
Wk-14
Date
Page
Assignment
1. Calculate the percentage of iron in K3 Fe (CN)
[K= 39, Fe =56, C= 12, N =14]
Answer:
The mass percentage of iron in [tex]\rm K_3[Fe(CN)_6][/tex] (potassium ferricyanide) is approximately [tex]17\%[/tex].
Explanation:
Start by finding the formula mass of potassium ferricyanide, [tex]\rm K_3[Fe(CN)_6][/tex], using relative atomic mass data from the question:
[tex]\begin{aligned} & M(\mathrm{K_3[Fe(CN)_6]}) \\ &\approx 3 \times 39 + 56 + 6 \times (12 + 14) \\ &= \rm 329 \; g \cdot mol^{-1}\end{aligned}[/tex].
In other words, every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units have a mass of approximately [tex]329\; \rm g[/tex].
On the other hand, note that there is one iron [tex]\rm Fe[/tex] atom in every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units. Hence, there would be exactly one mole of iron atoms in every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units. The mass of that one mole of iron atoms is approximately [tex]56\; \rm g[/tex] (again, from the relative atomic mass data of the question.)
Therefore:
[tex]\begin{aligned}& \text{Mass percentage of $\mathrm{Fe}$ in $\mathrm{K_3[Fe(CN)_6]}$} \\ &= \frac{\text{Mass of $\mathrm{Fe}$ in one mole of $\mathrm{K_3[Fe(CN)_6]}$ formula units}}{\text{Mass of one mole of $\mathrm{K_3[Fe(CN)_6]}$ formula units}}\times 100\% \\ &= \frac{M(\mathrm{Fe}) \times (\text{Number of $\mathrm{Fe}$ atoms in each $\mathrm{K_3[Fe(CN)_6]}$ formula unit)}}{M(\mathrm{K_3[Fe(CN)_6]})} \times 100\%\end{aligned}[/tex]
[tex]\begin{aligned}&\approx \frac{1 \times 56\; \rm g \cdot mol^{-1}}{329\; \rm g \cdot mol^{-1}}\end{aligned}[/tex].
each electron in an atom has a charge of -1 and each proton has a charge of 1. what is the overall charge of atom that contains 2 electron and 2 proton
Answer:
0
Explanation:
Positive Change of 2 cancels the negative charge of 2
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the overall charge of atom that contains 2 electron and 2 proton is zero.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The overall charge of atom that contains 2 electron and 2 proton is zero.
Therefore, the overall charge of atom that contains 2 electron and 2 proton is zero.
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Two Nitrogen atoms bonded together is what? *
O Atom
O Molecule
Help me please
A copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, calculate the mass in grans of the cylinder. (Assume pi=3.14
Answer:
we use: V = pi*(r^2)*h
V = 3.14*(12.0cm^2)*44.0 cm
V = 19895.04 cm^3
Therefore, mass = (8.90g/cm^3) * (19895.04 cm^3) = 177065.856 g
Explanation:
A copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, the mass of the cylinder is 180687.62g
What is density?Density is defined as the degree to which a material is packed together.
It is also defined as the measurement of the relative "heaviness" of objects with a fixed volume.
It is mass per unit volume.
Volume = ∧r²h
Volume = 3.14 x 12² x 44.9
= 20301.98 cm³
Density = mass / volume
So, mass = density x volume
= 8.90 g/cm³ x 20301.98
= 180687.62 g
Thus, a copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, the mass of the cylinder is 180687.62g.
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What is 745000 nanometers converted to millimeters?
Answer:
0.745 millimiters
i looked it up on google and this is the right answer
Calculate the answers to the appropriate number of significant numbers
32.567
135.0
+ 1.4567
—————
Answer:
32.567+135.0+1.4567=169.027
to significant figures is 16
Why the bromine and air can mix together?
A. Bromine is denser than air
B. Bromine is lighter than air
C. Bromine molecules moved upwards and molecules in air moved downwards
D. Molecules in bromine and air moved randomly
Chooses the correct statement from the above
Answer:
D. Molecules in bromine and air moved randomly
Explanation:
The molecules of both bromine and air are in the gas phase.
Since the molecules of gases are far apart and moving randomly, the bromine and air molecules can easily mix together.
A is partially correct. bromine is denser than air, but that doesn't explain why they mix.
B is wrong. Bromine is denser than air.
C is partially correct. The molecules of bromine and air moved upwards and downwards, but the also moved randomly in many other directions.
Given: Fe2O3(s) + 3 CO(g) –––––> 2 Fe(s) + 3 CO2(g); ΔH° = –26.8 kJ FeO(s) + CO(g) –––––> Fe(s) + CO2(g); ΔH° = –16.5 kJ determine ΔH° for the following thermochemical equation. Fe2O3(s) + CO(g) –––––> 2 FeO(s) + CO2(g)
Answer:
ΔH° = + 6.2 kJ
Explanation:
Fe₂O₃(s) + 3CO(g) –––––> 2 Fe(s) + 3 CO₂(g); ΔH° = –26.8 kJ ......... ( 1 )
FeO(s) + CO(g) –––––> Fe(s) + CO₂(g); ΔH° = –16.5 kJ .........( 2 )
Multiplying equation ( 2 ) by 2 and subtracting it from ( 1 )
Fe₂O₃(s) + 3CO(g) -2 FeO(s) - 2CO(g) ––> 2 Fe(s) + 3 CO₂(g) - 2Fe(s) - 2CO₂(g) ΔH° = –26.8 kJ - ( 2 x –16.5 kJ )
Fe₂O₃(s) + CO(g) -2 FeO(s)––> CO₂(g) ΔH° = –26.8 kJ + 33 kJ
Fe₂O₃(s) + CO(g) ––>2 FeO(s) +CO₂(g) ΔH° = + 6.2 kJ
Required ΔH° = + 6.2 kJ Ans .
Which model best represents the modifications to
the theory that Thomson's results made
necessary?
Answer:A
Explanation:
A bond in which valence electrons are shared is called covalent. is the process of breaking large molecules into smaller ones by adding water. If energy is released when a molecule is broken apart, it is a(n) reaction. The process of building up large molecules from small components is a(n) process. A lipid with four sites lacking hydrogen saturation is a lipid.
Answer:
A bond in which valence electrons are shared is called COVALENT.
HYDROLYSIS is the process of breaking large molecules into smaller ones by adding water.
If energy is released when a molecule is broken apart, it is an EXERGONIC REACTION.
The process of building up large molecules from small components is an ANABOLIC process.
A lipid with four sites lacking hydrogen saturation is a POLYUNSATURATED lipid.
How many sig figs does the answer to the following calculation have?
1.90 + 2.3 +5.700 = ?*
Answer:
The answer is 2 significant figures.
1.90+2.3+5.700=9.9
there is an ice cream shop 6 blocks north of your hotel. how many minutes will it take to walk there and back
Answer:
This question is incomplete
Explanation:
This question is incomplete.
However, when all the required data are available, you can use the formula/steps below
Average speed/velocity (m/s) = distance (in metres) ÷ time (in seconds)
Time (in secs) = distance ÷ average speed/velocity
Kindly note that "blocks" is not a standard unit for distance measurement in science, hence the distance (since its a walking distance) must be in metres (or converted to metres if not in metres).
The distance in the formula is the distance from the hotel to the ice cream shop while the average speed is the distance covered per time as s/he walks to the ice cream shop and back. Hence, the answer gotten from the formula above will have to be multiplied by 2 (in order to get the time taken to walk to the ice cream shop and back) because the formula will only provide answer to one trip (time taken to walk to the shop).
After the multiplication mentioned above, the time in seconds should be converted to minutes by dividing the answer in seconds by 60
is air a good conductor of electricity
Answer:
No, air is not a good conductor of electricity.
It is poor conductor.
do cfcs break down ozone
Answer:
Once in the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up. So true.
Hope this helps! （づ￣3￣）づ╭❤～
Which of the following BEST states the Law of Conservation of Matter?
Your answer:
B. The total mass of the reactants in a reaction is double the total mass of the product(s).
C. The total mass of the reactants in a reaction is less than the total mass of the product(s).
D. The total mass of the reactants in a reaction is greater than the total mass of the product(s).
Answer: there is not any correct answer but the law of conservation of matter states that the sum of the mass of the reactants should be equal to that of the product
true or false .Heat is the movement of thermal energy from one place to another.
Answer:
true.................
Answer:
Thermal energy that is transferred from one substance to another,moves from warmer to cooler objects. So True.
Explanation:
What are SL units ?
Answer:
International System of Units
Definition: A system of physical units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten.
Hope this helps!
water has density of 1.0 g/L. What volume of water has mass 250 g?
Answer:
Examine the units: If the density is 1 g/mL, how many mL do you need to make 250 g?
X mL * 1 g/mL = 250 g
Solve for X
x mL = 250 g / 1 g/mL = 250 mL
Hope this helps :)
The volume of water = 250 L
The formula for density:
[tex]density = \frac{mass}{volume}[/tex]
Given, density = 1.0 g/L = 0.001 kg/L
mass = 250 g = 0.25 kg
Putting the values in the equation
[tex]0.001 = \frac{0.25}{volume}[/tex]
[tex]volume = \frac{0.25}{0.001}[/tex]
[tex]volume = 250 L[/tex]
Hence, the volume of the water is 250 L.
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Make a circle graph for each set of data. Top 5 Most Linked-To Sites on the World Wide Web Site Hits (millions) America Online (www.aol.com) 93.0 Microsoft (www.msn.com) 83.8 Yahoo! (www.yahoo.com) 80.2 Terra Lycos (www.lycos.com) 40.3 About (www.about.com) 36.6 Source: Scholastic Kid’s Almanac, 2001 a. A circle graph. America Online is about 25 percent; Microsoft, 25 percent; Yahoo 23 percent; Terra Lycos, 15 percent; About, 10 percent. c. A circle graph. America Online is about 27 percent; Microsoft, 27 percent; Yahoo 22 percent; Terra Lycos, 12 percent; About, 10 percent. b. A circle graph. America Online is about 12 percent; Microsoft, 10 percent; Yahoo 27 percent; Terra Lycos, 17 percent; About, 23 percent. d. A circle graph. America Online is about 12 percent; Microsoft, 10 percent; Yahoo 25 percent; Terra Lycos, 25 percent; About, 20 percent. Please select the best answer from the choices provided A B C D
Answer:
A
Explanation:
A sample of ground beef contains 21.3% protein and 16.9% fat, both by mass. What mass of this ground beef, in grams, contains 350 Calories? Assume all Calories come from protein and fat.
Answer:
147.5 grams
Explanation:
Let the required mass of ground beef be m .
protein in it = .213 m
fat in it = .169 m
1 gram of protein gives 4 cals .
1 gram of fat gives 9 cals .
cals given by .213 m protein = 4 x .213 m .
cals given by .169 m fat = 9 x .169 m .
4 x .213 m + 9 x .169 m = 350
.852 m + 1.521 m = 350
2.373 m = 350
m = 147.5 grams Ans
what is the mass of 5.3 litres of carbon dioxide gas at STP
Answer:
Explanation:
given volume =5.3 litres
as we know that 1 litre =1 dm3
therefore 5.3 litres =5.3 dm3
now moles =given mass /molar mass
so mass =moles*molar mass
in order to find mass of carbon we need to find moles
therefore moles=given volume/standard volume standard volume at STP is 22.4 dm3
moles= 5.3/22.4
moles=0.236=0.24
now mass of carbon dioxide =moles*molar mass
mass = 0.24*44
mass=10.56kg
23. A certain sample of nitrogen gas consists of 9.26 1022 nitrogen atoms.
(a) How many moles of N atoms are present in this sample ?
(b) If the gas is entirely in molecular form, how many molecules are present in this
sample?
(c) What is the mass of the sample in gramme?
Answer:
a) 0.154 moles of N2
b) 9.27 × 10^22 molecules
c) 4.312 g
Explanation:
a)
1 mole of N2 contains 6.02 × 10^23 atoms
x moles of N2 contains 9.26 × 10^22 atoms
x= 9.26 ×10^22/6.02 × 10^23
x= 1.54 ×10^-1
x= 0.154 moles of N2
b)
1 mole of N2 contains 6.02 × 10^23 molecules
0.154 moles of N2 contains 0.154 moles × 6.02 × 10^23 = 9.27 × 10^22 molecules
c)
Molar mass of the nitrogen gas= 28 gmol^-1
Number of moles of nitrogen gas = 0.154 moles
Number of moles = mass/molar mass
0.154 moles= mass/28 gmol^-1
Mass= 0.154 moles × 28gmol^-1
Mass= 4.312 g
Which of the following describes the characteristics of a plasma? (3 points) a Particles are packed closely together, have low compressibility, and usually maintain their organized, set shape. b Particles are positively and negatively charged, have high compressibility, and spread out to fill a container. c Particles move around in a semi-organized way, take the shape of a container, and fill a container from the bottom up. d Particles move freely, have high compressibility, and spread out evenly to fill a container.
Answer:
The correct option is;
b. The particles are positively and negatively charged, have high compressibility, and spread out to fill a container
Explanation:
Plasma are gases that contain positively and negatively charged particles. Therefore, plasma flow drift in space such that plasma. like gases has no characteristic shape or volume but takes the shape and fills the entire volume of a container in which it is placed
Other characteristics of plasma are that plasma is a conductor of electricity and magnetic fields can therefore exist in plasma due to the fact that plasma are made of atoms in which part or all of the electrons have been removed leaving the ions to roam freely in a container.
please help. fill out the blanks
can you pls tell me the word equations for all these equations
Answer:
Below
Explanation:
Balanced form;
[tex]2C_6H_6 +15O_2 -> 12CO_2+6H_2O\\\\ Ca_3(PO_4)_2 +8C -> Ca_3P_2 +8CO\\\\2HNO_2+O_2 -> 2HNO_3\\\\Ca(OH)_2 + CO_2 -> CaC0_3+H_2O\\\\2K +Br_2 ->2KBr\\\\2NaOH+FeSO_4 -. Na_2SO_4 +Fe(OH)_2[/tex]
1.Benzene + Dioxygen = Carbon Dioxide + Water
2.Tricalcium phosphate +Carbon = Calcium phosphide + carbon monoxide
3.Nitrous acid react with oxygen to produce nitric acid.
4.This means that the carbon dioxide and limewater react to produce calcium carbonate and water.
5.Potassium react with bromine to produce potassium bromide
6. An aqueous solution of ferrous sulphate reacts with aqueous solution of sodium hydroxide to form a precipitate of ferrous hydroxide and sodium sulphate remains in the solution.