Stoichiometry Empirical and Molecular Formulas

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

• Mg₄N₃
• MgN₂
• Mg₃N₂ 
• MgN

What is the percentage of oxygen in carbon dioxide? (CO2)

• 27.3%
• 72.7%
• 30%
• 70%

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

• SO
• SO2
• SO3
• SO4

A formula with the lowest whole # ratio of elements in a compound is called

• Molecular Formula
• Chemical Formula
• Empirical Formula 
• Distance Formula

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

• NO
• N₂O₃
• N₂O₄
• N₂O₅

A 5.00 g sample of a compound consisting of calcium and chlorine contains 1.82 g of calcium and 3.23 g of chlorine. What is the empirical formula?

• CaCl₂

• Ca₂Cl₄

• Ca₂Cl₂

• Ca₄Cl₂

A 154 g sample of a compound contains 15.01 g of C and 62.03 g of Cl. What is the empirical formula for this compound?

• CCl₃

• CCl₄

• C₄Cl

• CCl

What is the name of the following reactants?

• hydrogen chloride plus sodium hydroxide.
• hydrochloric acid plus sodium hydroxide.
• dihydrogen monoxide plus sodium hydroxide.
• dihydrogen monoxide plus sodium chloride.

What is the mole to mole ratio of propane to carbon dioxide in the equation?

• 1:3
• 1:5
• 1:4
• 1:1

Tags

NGSS.HS-PS1-7

What is the conversion factor from mol to particles?

• 2018
• 6.02 x 10^23 
• 22.4 
• molar mass