Mole/Percent Composition/Empirical and Molecular Formula

How many molecules are in 2.50 mol of NaCl?

• 1.51x10²³
• 146
• 4.15
• 1.51x10²⁴

How many atoms of carbon are in 6.00g of carbon?

• 1.20x10²⁴atoms C
• 6.02x10²³atoms C
• 3.01x10²³atoms C
• 1.50x10²³atoms C

Tags

NGSS.HS-PS1-7

How many steps are in a gram to mole conversion?

• 1
• 2
• 3
• 4

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

Tags

NGSS.HS-PS1-7

What is the mass of 0.89 mol of CaCl₂?

• 111 grams
• 0.008 grams
• 98.9 grams
• none of the choices

How many steps are in a gram to molecule conversion?

• 1
• 2
• 3
• 4

What is the molar mass of PbSO₄?

• 303.27 g/mol

• 255.27 g/mol

• 163.87 g/mol

• 372.27 g/mol

What is the percent composition of oxygen in MgO?

• 20%

• 40%

• 50%

• 60%

Tags

NGSS.HS-PS1-7

What is the percent composition of sodium in NaCl?

• 39%

• 61%

• 35%

• 65%

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

• Mg₄N₃
• MgN₂
• Mg₃N₂ 
• MgN