# What is the total number of moles present in a 52.0 gram sample of #NaN_3#?

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Gram-formula mass = 65.0 grams/mole

Gram-formula mass = 65.0 grams/mole

##### 1 Answer

#### Explanation:

The formula for calculating moles given the mass and a compound is:

#n = m/M#

The molar mass is the sum of all the atomic masses in the compound.

#"Na" = "22.99 g/mol"#

#"N" = "14.01 g/mol" xx 3 -># (there are#3# #"N"# atoms)

Add them up and you get

#n = m/M#

# = (52.0 cancel("g"))/(65.02 cancel("g")/"mol")#

#= "0.799753921 moles"#

#= "0.800 moles " -># (rounded to three sig figs)

Therefore, there are

I hope this made sense :)