7.26: REVIEW WQUIZIZZ:QUIZ 7.2: EMP. FORMULAS: 5D 14W S1 23 CHM

Which of the following are correct ratios of a constituent element in the main ingredient of vinegar, acetic acid, C₂H₄O₂? Select all that apply.

• 2 C : 1 C₂H₄O₂
• 1 C₂H₄O₂ : 1 O
• 4 H : 1 C₂H₄O₂
• 1 C₂H₄O₂ : 4 O

Which of the following are correct ratios of a constituent element of the main ingredient in fertilizer, ammonia, NH₃? Select all that apply.

• 3 mol H : 1 mol NH₃
• 1 mol NH₃ : 4 mol H
• 1 mol NH₃ : 1 mol N
• 2 mol N : 1 mol NH₃

When converting from grams of a formula to moles of a formula, you will use (a.), but when converting from of a formula to moles of a constituent element, you will use (b.).

• (a.) formula molar mass, (b.) formula subscripts
• (a.) Avogadro's number, (b.) formula molar mass
• (a.) formula molar mass, (b.) element molar mass

Calculate how many moles of S₂C𝑙₂ contain 7.78 moles of S.

• 3.89 mol S₂C𝑙₂
• 15.6 mol S₂C𝑙₂
• 1.95 mol S₂C𝑙₂
• 2.43 mol S₂C𝑙₂

Calculate how many moles of H are in 1.73 moles of (NH₄)₂SO₄.

• 13.8 mol H
• 6.92 mol H
• 3.46 mol H
• 8.12 mol H

What did the student do wrong with the following set-up for the conversion of 2.85 g H to g of H₂O?

• The student used an incorrect atom to formula ratio
• The student calculated the wrong molar mass for water, H₂O.
• The student has the correct set-up, but calculated incorrectly.
• The student placed the molar mass in the wrong position.

What mass, in grams, of F are in 149 g of SF₆?

• 116 g F
• 136 g F
• 121 g F
• 78.4 g F

What mass, in grams, of O are in 92.6 g of KMnO₄?

• 37.5 g O
• 9.38 g O
• 1.93 g O
• 21.4 g O

Calculate the mass, in grams, of P₂O₅ that contains 12.9 g P.

• 29.6 g P₂O₅
• 16.7 g P₂O₅
• 59.1 g P₂O₅
• 38.5 g P₂O₅

How many moles of H₂S contain 2.03 mol of S?

• 2.03 mol H₂S
• 4.06 mol H₂S
• 3.07 mol H₂S
• 0.741 mol H₂S