Percent Composition & Empirical Formula Review

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

• SO
• SO2
• SO3
• SO4

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 empirical formula of a substance with the molecular formula X₂₀Y₁₅?

• X₁₀Y₁₅

• X₅Y₃

• X₄Y₃

• X₂₀Y₁₅

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

Calculate the molar mass for Al(OH)₃

• 78.0 g/mol

• 72 g/mol

• 28 g/mol

• 25 g/mol

(Round molar mass to 1 decimal place)

The molar mass of HCl is _________ grams

(Round molar mass to 1 decimal place)

Hydrogen makes up _______ % of the mass of HCl

Determine the empirical formula of a compound containing 63.50 % silver, 8.25 % nitrogen, and the remainder oxygen.

• AgNO₃

• Ag₂NO₃

• AgNO₂

• Ag₂N₂O₅

Tags

NGSS.HS-PS1-7

What is the empirical formula for C₃H₈

• CH
• C₃H₈
• C₆H₁₆
• CH_2.7

Which one is the empirical formula?

C₄H₆

• CH

• CH₃

• C₂H₃

• C₄H₆