Mol 3

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

• NO
• N₂O₃
• N₂O₄
• N₂O₅

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.
• is the simplest whole-number ratio of moles of elements in the compound.

What do you do when you get a half in the ratio?

• add 2 to each element
  add two to only the one with the half
• multiply the one with the half only by two
• multiply all of them by two
• add two to all of the ratios

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)

• SO
• SO₂
• SO₃
• SO₄

What is the empirical formula for P₄O₁₀?

• P₄O₁₀

• P₂O₅

• P₄O₅

• PO

What is the empirical formula for C₃H₆N₆O₆?

• CH₃N₃O₃

• CHNO

• C_1.5H₃N₃O₃

• CH₂N₂O₂

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

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

Tags

NGSS.HS-PS1-7

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

What is the molecular formula of a compound with an empirical formula of C₂OH₄ and a molar mass of 88 grams per mole?

• C₂O₄H₈
• C₈O₂H₄
• C₄O₂H₈
• C₄O₈H₂