Percent Mass

What is the percent by mass of 5.0 g of iron (II) sulfate dissolved in 75.0 g of water?

Based on the given problem what is the amount of solution?

• 5g iron(II) sulfate

• 75g water

• 80g solution

• 6.25%

What is the percent by mass of 5.0 g of iron (II) sulfate dissolved in 75.0 g of water?

Based on the given problem what is the amount of solute?

• 5g iron(II) sulfate

• 75g water

• 80g solution

• 6.25%

What is the percent by mass of 5.0 g of iron (II) sulfate dissolved in 75.0 g of water?

Based on the given problem what is the solvent?

• iron(II) sulfate

• water

• solution

• all answers are correct

How do we compute for percent by mass?

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Tags

NGSS.MS-PS1-1

A solution is formed by adding 5 g of ammonium nitrate to 15 g of water. What is the percent by mass of ammonium nitrate?

Using the student’s data, what is the correct numerical setup for calculating the percent composition by mass of water in the hydrate?

• %H₂O = (2.13 g / 0.76 g) × 100

• %H₂O = (2.13 g / 21.37 g) × 100

• %H₂O = (0.76 g / 1.37 g) × 100

• %H₂O = (0.76 g / 2.13 g) × 100

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the percent composition by mass of nitrogen in the compound N₂H₄ (gram-formula mass = 32 g/mol)?

• 13%

• 44%

• 88%

• 93%

Which compound has the greatest percent composition by mass of sulfur?

• BaS

• CaS

• MgS

• SrS

Which compound has the highest percent composition by mass of strontium?

• SrCl₂

• SrI₂

• SrO

• SrS

Which compound has the smallest percent composition by mass of chlorine?

• HCl

• KCl

• LiCl

• NaCl