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Percent Composition from Mass Data

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Questions and Answers

What is the total number of moles of atoms in one mole of a compound?

6.022 x 10^23 (correct)
The number of atoms in the molecule
The molecular mass of the compound
1 mole

What is the percentage of oxygen in Cu(OH)2?

33.4% (correct)
25.5%
54.7%
40.2%

What is the empirical formula of a compound with the molecular formula C6H18O3?

CH6O
CH2O
C2H6O
CH3O (correct)

What is the mass of one mole of NaCl?

58.44 g (B) Signup and view all the answers

What is the percentage of carbon in a compound with the molecular formula C6H18O3?

43.5% (A) Signup and view all the answers

How many moles of CO2 are in 92.87 liters of CO2 gas at STP?

4.15 moles (C) Signup and view all the answers

What is the mass percentage of element Y in a compound XY with a total mass of 42.6 grams, where Y has a mass of 22.9 grams?

53.8% (C) Signup and view all the answers

What is the molar mass of Krypton gas (Kr)?

83.80 g/mol (D) Signup and view all the answers

What is the density of a gas at STP?

1 g/L (B) Signup and view all the answers

How many liters of Hydrogen gas at STP are in 3.8 moles?

84.8 L (B) Signup and view all the answers

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