Mass-mol-percent-stoichiometry exam

What is the molar mass of ammonium chloride? Masses-N=14.007, H=1.0079, and Cl=35.453

• 53.49 grams/mol

• 156.8 grams/mol

• 101.9 grams/mol

• 50.46 grams/mol

What is the gram formula mass of Al₂(SO₄)₃? Masses-Al=26.982, S=32.065, O=15.999

• 262.14 grams/mol

• 342.14 grams/mol

• 450.06 grams/mol

• 197.96 grams/mol

What is the mass % of carbon in dimethylsulfoxide C₂H₆SO?

• 20.6 %

• 30.7 %

• 7.74 %

• 60.0 %

• 79.8 %

In the reaction given below, if 12 moles of aluminum oxide are consumed, how many moles of oxygen gas are produced? 2 Al₂O₃ --> 4 Al + 3 O₂

• 3 mols

• 4 mols

• 6 mols

• 12 mols

• 18 mols

Tags

NGSS.HS-PS1-7

In the reaction below, 8.0 g of H₂ react with 9.0 g of O₂. Which of the following statements is true? 2 H₂ + O₂ --> 2 H2O

• The equation is not balanced.

• The H₂ is the limiting reactant.

• .The O₂ is the limiting reactant.

• 2.0 moles of H₂O would be produced.

• 36 grams of H₂O would be produced.

Tags

NGSS.HS-PS1-7

If 70.9 g of chlorine reacts with sufficient cesium to produce cesium chloride, what is the theoretical yield? 2 Cs + Cl₂ -->2 CsCl

• 70.9 grams

• 132.9 grams

• 146 grams

• 337 grams

• 285 grams

Tags

NGSS.HS-PS1-7

How many moles of Fe₂O₃ are in 79.85 g Fe₂O₃?

• 0.50 mols

• 1.0 mols

• 0.25 mols

• 0.10 mols

What is the molar mass of a compound if 5 moles has a mass of 100 g?

• 0.05 grams/mol

• 20 grams/mol

• 500 grams/mol

• 5.0 grams/mol

What mass of glucose would you need (in grams) to have 0.8 mol, given that the molar mass of glucose is 180 grams/mol? C₆H₁₂O₆

• 144 grams

• 0.0044 grams

• 225 grams

• 1.44 grams

If 39.2 g of phosphorus reacts with 60.8 g of sulfur to form a compound of P and S, what is the simple formula of the compound?

Atomic Weights: P = 31.0; S = 32.1

• P₃S₂

• P₂S

• P₃S₄

• P₂S₃

• P₄S₃

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5