Percent Composition and Mole Calculation

The percentage by mass of each element in a compound

• dimensional analysis

• percent composition

• percent yield

• limiting reactant

What is the percent composition by mass of sulfur (S) in the compound MgSO₄?

• 20.22%

• 19.85%

• 26.64%

• 28.64%

Tags

NGSS.HS-PS1-7

Calculate the number of atoms in 0.0340 g Zn.

• 5.200 x 10^-4 atoms Zn

• 3.130 x 10²³ atoms Zn

• 3.130 x 10²⁰ atoms Zn

• 1 atom Zn

Tags

NGSS.HS-PS1-7

Determine the mass of 4.20 moles of C₆H₁₂

• 354 g

• 84 g

• 337 g

• 421 g

How would you calculate the percentage of Hydrogen?

d

c

a

100

18

2

16

(Page 38-40) Complete the formula for % Composition.

a

b

c

mass of element

total mass of compound

100

What is the percent composition of chlorine in sodium chloride (NaCl)? (Atomic masses: Na = 22.99 g/mol, Cl = 35.45 g/mol)

• 60.66%

• 39.34%

• 50.50%

• 49.50%

Tags

DOK Level 2: Skill/Concept

• 25.13%

• 74.87%

• 20.11%

• 79.89%

Tags

DOK Level 2: Skill/Concept

• 88.81%

• 11.19%

• 89.11%

• 10.89%

Tags

DOK Level 2: Skill/Concept

Find the percent composition of Aspirin C9H8O4?

• 180 g/mol

• O

• 35.6%

• Molar Mass of C9

• 4.4%

• H

• 108 g/mol

• C

• 60%

• Molar Mass of Aspirin