The Mole and Formulas

How many grams are in 1.2 x 10²⁴ molecules of CO?

• 28 grams
• 56 grams
• 6.02 grams
• 1.2 grams

Tags

NGSS.HS-PS1-7

How many steps are in a gram to mole conversion?

• 1
• 2
• 3
• 4

How many moles are in 3.01 x 10²² atoms of magnesium?

• 0.05 moles
• 1.81 x 10⁴⁶ moles
• 5.00 x 10²¹ moles
• 5 moles

What is the molar mass of table salt (NaCl)?

• 116 g/mol

• 35.5 g/mol

• 22 g/mol

• 58.5 g/mol

What is the mass of 0.89 mol of CaCl₂?

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

Tags

NGSS.HS-PS1-7

How many steps are in a gram to molecule conversion?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-7

Avogadro’s number is:

• 6.02 x 10²²

• 6

• 6.02 x 10²³

• 3.01 x 10²³

(0901) Determine the number of moles in 5.2 x 10²² atoms of gold.

• 0.086 mole

• 0.52 mole

• 8.63 x 10⁴⁴ moles

• 3.1 x 10⁴⁶ moles

What is the equation for calculating percent composition?

• mass of element/mass of compound = x 100
• mass of compound/mass of element = x 100 
• total mass/molar mass = x 100 
• molar mass/molar mass = x 100 

What is the percent composition by mass of magnesium in the compound MgSO₄

• 20%

• 27%

• 46%

• 53%