G9-Q4-Worksheet 1

A student reacts 5.6 g of iron (Fe) with sulfur. How many moles of iron are used?

• (A) 0.05 mol
• (B) 0.10 mol
• (C) 0.15 mol
• (D) 0.20 mol

A balloon contains 1.2×1024 helium (He) atoms. What is the mass of the helium?

• (A) 2 g
• (B) 4 g
• (C) 6 g
• (D) 8 g

An alchemist claims to produce 3.2 moles of silver (Ag). What is the mass of the silver?

• (A) 216 g
• (B) 345 g
• (C) 432 g
• (D) 512 g

A biologist dissolves 117 g of NaCl in water. How many moles of NaCl is this?

• (A) 1 mol
• (B) 2 mol
• (C) 3 mol
• (D) 4 mol

A rocket uses H₂ and O₂ to produce water: 2H2​(g)+O2​(g)→2H2​O(l) How many moles of H₂ are needed to make 36 moles of H₂O?

• (A) 18 mol
• (B) 36 mol
• (C) 54 mol
• (D) 72 mol

What is the formula to convert moles to particles?

• A) moles × molar mass
• B) moles ÷ Avogadro’s number
• C) moles × Avogadro’s number
• D) moles × density

Which is a conversion from atoms to mass?

• A) Atoms → moles → grams
• B) Mass → atoms → moles
• C) Moles → atoms → grams
• D) Moles → grams → atoms

3.00 mol of Cu weighs:

• A) 64 g
• B) 160 g
• C) 191 g
• D) 98 g

In 1.25 mol of Al₂O₃, how many moles of Al³⁺?

• A) 1.25
• B) 2.00
• C) 2.50
• D) 3.75

One mole contains 6.02 × 10²³ particles.

• T
• F