Chemistry Molar Mass and Empirical Formula Quiz

What is the molar mass of MgSO4?

• 116.13 g/mol

• 272.83 g/mol

• 120.37 g/mol

• 111.21 g/mol

Which of the following is the mass in grams of 4.25 x 10³ mol of N₂?

• 1.52 x 10² g

• 2.35 x 10^-4 g

• 1.19 x 10⁵ g

• 5.95 x 10⁴ g

How many atoms are in a 591 g sample of gold?

• 1.81 x 10²⁴

• 1.69 x 10²³

• 3.60 x 10²⁵

• 9.99 x 10⁵²

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

• Molecular Formula

• Covalent Formula

• Empirical Formula

• Formula Unit

What is the molecular formula if the empirical formula is CH₂O and the subscripts are multiplied by 6.

• CH₂O

• C₂H₄O₂

• C₄H₈O₄

• C₆H₁₂O₆

What is the empirical formula for the following molecule?

C₂₀H₄₀O₁₀

• CH₂O

• C₂H₆O₂

• C₂H₄O₂

• C₂H₄O

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

• NO

• N₂O₄

• N₂O₃

• N₂O₅

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

• SO
• SO₂

• SO₃

• SO₄

Find the percent composition of Cu₂S?

• %Cu= 67.987 %S= 32.013

• %Cu= 79.854 %S= 20.145

• %Cu= 35.946 %S= 64.054

Empirical Formula = CF₂

Molecular formula mass = 192 g/mol

Molecular Formula = ?

• C₄F₈

• C₈F₄

• C₃F₆

• C₂F₄