Mole Composition

How many molecules are in 2.5 mol of NaCl?

• 1.50 x10²⁴ molecules

• 1.50 molecules

• 4.15 molecules

• 1.51 x10²⁴ molecules

How many moles are in 19.82 g Mg?

• 1.23 mol Mg

• 481.70 mol Mg

• 1.00 mol Mg

• 0.82 mol Mg

How many grams are in 1.2 x 10²⁴ atoms of C?

• 29.34 grams

• 23.94 grams

• 6.02 grams

• 1.21 grams

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

What is the molar mass of PbSO₄

• 303.3 g/mol
• 294.7g/mol
• 163.8g/mol
• 372g/mol

Tags

NGSS.HS-PS1-7

How many hydrogen atoms are in one formula unit of C2H4O2?

• 2

• 1

• 4

• 6

Tags

NGSS.MS-PS1-1

What is the chemical formula for calcium carbonate?

• Ca(CO)3

• CaCO3

• CaC3

• Ca3(OH)

Tags

NGSS.MS-PS1-1