Moles Exam Final Review

What is the percent composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

• 20%
• 27%
• 46%
• 53%

What is the percent by mass of fluorine in CaF₂ (gram-formula mass = 78 g/mol)?

• 24%
• 49%
• 51%
• 65%

Tags

NGSS.MS-PS1-1

Which one is empirical?

• H₂O₂
• C₂H₆O₁₂
• CaCl₂
• N₂O₈

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

• C₆H₁₄
• C₃H₇
• CH₂
• CH₃

What is the empirical formula of the following molecular formula:  C₃H₆

• C₃H₆
• CH₂
• C₂H₄
• CH₃

C₆H₁₂O₆ 

• Molecular 
• Empirical
• Both

What is the molar mass of fluorine gas, F₂?

• 18.998 g/mol
• 38 g/mol
• 9 g/mol
• 18 g/mol

How many moles is 4 grams of Calcium?

• 0.10 moles
• 10 moles
• 44 moles
• 160 moles

How many grams is 1.2 moles of Neon?

• 0.05 grams
• 16.6 grams
• 21.2 grams
• 24 grams

The covalent compound H₂O has 

• 2 moles of oxygen and 1 mole of hydrogen
• 2 moles of hydrogen and 1 moles of oxygen
• both are correct
• none are correct

Tags

NGSS.MS-PS1-1