7) How many moles are in 125 grams of oxygen difluoride, OF2?
(O = 16.00 g/mol, F = 19.00 g/mol)
Group of answer choices
54.0
2.31
0.43
67.5
8) Which of the following contains the same number of moles of atoms as 6.00 grams of carbon?
Group of answer choices:
12.00 g of Si
12.15 g of Mg
6.00 g of Si
8.00 g of He
9) Which sample would contain the largest number of atoms?
(C = 12.01 g/mol, Si = 28.08 g/mol, S = 32.1 g/mol, Au = 196.97 g/mol)
Group of answer choices:
19.6 g of Au
8.0 g of S
7.0 g of Si
4.0 g of C
10) How many grams would it take to make 0.25 moles of carbon disulfide, CS2?
(C= 12.01 g/mol, S = 32.1 g/mol)
Group of answer choices
14.0
19.0
76.2
11.0
7)
mass of OF2 = 125 g
moles of OF2 = 125 / 54 = 2.31
Answer : 2.31
8) Which of the following contains the same number of moles of atoms as 6.00 grams of carbon?
mass of C = 6.00 g
moles of C = 6.00 / 12 = 0.500 mol
moles of Mg = 12.15 / 24.3 = 0.500 mol
answer : 12.15 g of Mg
9)
moles of Au = 19.6 / 196.97 = 0.0995
moles of S = 8 / 32 = 0.25
moles of Si = 7 / 28 = 0.249
moles of C = 4 / 12 = 0.33
carbon has largest number of atoms
Answer : 4.0 g of C
10)
(C= 12.01 g/mol, S = 32.1 g/mol)
moles of CS2 = 0.25
mass of CS2 = 0.25 x 76.21 = 19.0 g
Answer : 19.0
7) How many moles are in 125 grams of oxygen difluoride, OF2? (O = 16.00 g/mol,...
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