Moles Review

Avogadro’s number is:

• 6.02 x 10²²

• 6

• 6.02 x 10²³

• 3.01 x 10²³

A student wants to determine how many water molecules are in 5.2 moles of water.  Which conversion would the student use to convert from moles to number of molecules?

•  $\frac{1\ mole}{6.02\ x\ 10^{23}\ molecules}$ 

•  $\frac{6.02\ x\ 10^{23}moles}{1\ molecule}$ 

•  $\frac{6.02\ x\ 10^{23}molecules}{1\ mole}$ 

•  $\frac{1\ molecule}{6.02\ x\ 10^{23}\ moles}$ 

How many water molecules are in 5.2 moles of water?

• 6.0 x 10²³ molecules

• 5.2 molecules

• 3.1 x 10²⁴ molecules

• 8.6 x 10^-24 molecules

How many moles of methane (CH₄) are in 1.24 x 10²⁶ molecules of methane?

• 6.02 x 10²³ moles

• 7.46 x 10⁴⁸ moles

• 978 moles

• 206 moles

The mass of one mole of a substance is called...

• molecular mass

• mole constant

• molar mass

• atomic weight

Tags

NGSS.HS-PS1-7

What is the molar mass of NaCl?

• 58.44g/mol

• 28g/mol

• 12g/mol

• 6.02 x 10²³

Tags

NGSS.HS-PS1-7

What is the molar mass of Ca(NO₃)₂?

• 148.096 g

• 164.086 g

• 102.055 g

• 70.084 g

Tags

NGSS.HS-PS1-7

What would be the mass of 1.5mol H₂O

• 20

• 27

• 32

• 40

How many moles of carbon atoms are there in 5g of carbon?

• 60 mol

• 17 mol

• 0.42 mol

• 7 mol

What is the mass of 9.4 moles of B₂(Cr₂O₇)₃?

*Molar Mass = 669.62 g/mol

• 6.41 x 10²²g

• 5.67x10²⁴ g

• 4,339.23 g

• 6,294.42 g

Tags

NGSS.HS-PS1-7