formulamasspractice

How many moles are in 16.94g of water?

• 16.94 mol H₂O
• 0.9401 mol H₂O
• 305.3 mol H₂O
• 1.063 mol H₂O

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

Whats the empirical formula of a molecule containing 18.7% of Lithium, 16.3% of Carbon and 65.0% of oxygen?

• CO₂Li₃
• Li₂CO₃
• Li₃CO₂
• LiCO₅

How many molecules are in 9.44 moles of aluminum chloride?

• 5.68 molecules AlCl₃
• 5.68x10²⁴ molecules AlCl₃
• 0.705 molecules AlCl₃
• 1.25x10²³ molecules AlCl₃

Tags

NGSS.HS-PS1-7

Find the percent composition of hydrogen in ammonium sulfide.

• 11.8%
• 41.1%
• 47.1%

What is the mass percentage of carbon in carbon dioxide?

• 27.3%
• 42.9%
• 57.1%
• 72.7%

Assign oxidation number to P in the compound
PBr₃

• +1
• +2
• +3
• -1

SF₆

• Monosulfur Hexaflourine
• Sulfur Hexafluorine 
• Sulfur Hexaflouride
• Monosulfur Hexaflouride

What is the molar mass of NaOH?

• 39.997 g/mol
• 38.989 g/mol
• 23.998 g/mol
• 57.004 g/mol

The chemical formula for tin (IV) oxide is written

• Sn₂O₄
• Ti₂O₄
• SnO₂
• TiO₂