% composition emp and molec formulas

What is the molar mass of table salt (NaCl)?

• 116.886 g/mol
• 35.453 g/mol
• 22.990 g/mol
• 58.443 g/mol

What is the mass of 0.89 mol of CaCl₂?

• 111 grams
• 0.008 grams
• 98.9 grams
• none of the choices

Fill in the blank....
Percent to Mass, Mass to Mole, ____________, Multiply till whole. 

• Multiply by Small
• Divide by Small
• Divide till Whole
• Divide by the number off the PT

What is the equation for calculating percent composition?

• mass of element/mass of compound = x 100
• mass of compound/mass of element = x 100 
• total mass/molar mass = x 100 
• molar mass/molar mass = x 100 

What is the percent composition by mass of magnesium in the compound MgSO₄

• 20%

• 27%

• 46%

• 53%

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

• Cu₃O₈
• CuO₄
• Cu₂O
• Cu₄O₁₀

What is the empirical formula for the following molecular formula: C₆H₁₄

• C₆H₁₄
• C₃H₇
• CH₂
• CH₃

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

• C₂H₅
• C₄H₁₀
• C₁H_2.5
• C₄H₈

A compound with the following composition has a molar mass of 60.10g/mol: 39.97% carbon; 13.41% hydrogen; 46.62% nitrogen. Find the molecular formula.

• C₂H₃N₂

• CH₂N

• CH₄N

• C₂H₈N₂

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%