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Worksheetsmixed mole and percent comp homework
Total questions: 28
Worksheet time: 1hrs 5mins
How many molecules are in 2.5 mol of NaCl?
1.50 x1024 molecules
1.50 molecules
4.15 molecules
1.51 x1024 molecules
How many moles are in 19.82 g Mg?
1.23 mol Mg
481.70 mol Mg
1.00 mol Mg
0.82 mol Mg
How many moles are in 3.01 x 1022 atoms of magnesium?
0.05 moles
1.81 x 1046 moles
5.00 x 1021 moles
5.00 moles
What is the percent composition by mass of sulfur (S) in the compound MgSO4?
20.22%
19.85%
26.64%
28.64%
Determine the mass of 4.20 moles of C6H12
354 g
84 g
337 g
421 g
How many grams are in 1.2 moles of Neon?
0.05 grams
16.6 grams
21.2 grams
24 grams
How many hydrogen atoms are in one formula unit of C2H4O2?
2
1
4
6
Use the given the chemical equation to answer the following question:
2C2H6 + O2 → 4CO2 + 6H2O
What does the number 4 represent for the formula unit 4CO2 ?
The number 4 represents the coefficient, which is also equal to the number of grams of the formula unit above.
The number 4 represents the subscript, which is also equal to the number of moles of the formula unit above.
The number 4 represents the coefficient, which is also equal to the number of moles of the formula unit above.
The number 4 represents the subscript, which is also equal to the number of grams of the formula unit above.
How many grams of NH3 would result in 8 moles of NH3. What does the the number 8 do to the molar mass of the compound?
The number 8 is added to the molar mass to give 25 g/mol.
The number 8 multiplies the molar mass by 8 to give 136 g/mol.
The number 8 divides the molar mass by 8 to give 2.13 g/mol.
The number 8 does not change the molar mass of the compound.
Which of the following methods should be used in order to calculate the molar mass of magnesium hydroxide?
Add the masses of two moles Mg to the mass of one mole OH
Add the total protons and neutrons.
Add the masses of one mole Mg to the mass of one mole OH
Add the masses of one mole Mg to the masses of two moles of OH.
Find the number of molecules in 1.75 moles of Cu metal.
1.0535x1024
1.05x1025
1.05x1024
10.54x1023
Find the number of moles in 4.95x1024 Ne atoms.
8
0.822
8.22
8.22x1046
How many atoms are present in a formula unit of Fe2(CrO4)3 ?
5
3
17
13
Find the molar mass of CO2 in grams, with four significant figures.
44.01 g
28.01 g
22.00 g
44 g
Find the number of moles of nitrogen molecules in 55.0 liters of pure nitrogen gas, at standard temperature and pressure.
2.46 moles
0.407 moles
3.31x1025 moles
4.92 moles
Octane has a formula of C8H18. Find the percent composition of carbon by weight in octane.
84%
528%
5.28%
30%
A chemical reaction produces 0.37 mol of N2 gas. What volume will that gas occupy at STP?
0.02 L
10.4 L
5.2 L
8.3 L
Convert 86.235 g of diphosphorus pentaoxide to moles.
12240 moles
1.8747 moles
.608 moles
.60755 moles
