Mole calculations

How many particles are in 13.5 grams of Beryllium?

• 1.5 particles
• 9 particles
• 4x10²³ particles
• 9x10²³ particles

Tags

NGSS.HS-PS1-7

Calculate the number of gold atoms in a 4 mole sample of gold.

• 2.41x10²⁴
• 3.01x10²³
• 4.82x10²⁴
• 6.02x10²³

Tags

NGSS.HS-PS1-7

Calculate the mass of iron in a sample of iron ore containing 2.61x10²³ iron atoms.

• 0.433g
• 24.2g
• 44g
• 6.02g

Tags

NGSS.HS-PS1-7

Calculate the % composition by mass of oxygen present in H₂SO₄.

• 16.3%
• 65.25%
• 32.6%
• 57.14%

Calculate the number of oxygen atoms present in 14kg of Ba(NO₃)₂

• 53.578 atoms
• 3.22x10²⁵ atoms
• 3.22x10²² atoms
• 6.44x10²² atoms

Tags

NGSS.HS-PS1-7

What is the empirical formula of a compound if the molecular formula is W₁₈O₉?

• W₁₈O₉
• W₂O
• W₆O₃
• none of the above

What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?

• C₃H₈
• CH₄
• C₂H₂
• C₄H₁₀

Tags

NGSS.HS-PS1-7

What is the molar mass of calcium hydroxide, Ca(OH)₂?

• 74.1 g/mole
• 57.1 g/mole
• 58.1 g/mole
• none of the above

What is the total mass in grams of 0.75 mole of SO₂?

• 16 g
• 24 g
• 32 g
• 48 g

Tags

NGSS.HS-PS1-7

How many atoms of iodine are in one mole of iodine?

• 53

• 63.55g

• 126.9

• 6.02 x 10²³