Question

Nurse Antonio measured out 7 grams of sodium chloride (NaCI). Using dimensional analysis, calculate how many moles of NaCI he weighed out.

Answer 1

0.119 moles

Step-by-step explanation:

Given that,

Mass measured by Nurse Antonio is 7 grams of NaCl

To find,

The no of moles of NaCl

Solution,

The number of moles is given by

`n=(m)/(M)`

m is given mass

M is molar mass

For NaCl, molar mass is 23+35.5 = 58.5 grams

So,

`n=(7)/(58.5)\\\\n=0.119\ \text{moles}`

Therefore, there are 0.119 moles of NaCl.