How many moles of salt are in 1.005 kg of NaCl? (Hint: 1 kg = 1000g) O 17.8 mol
18.0 mol
17.2 mol
O 18.2 mol

The answer is

Explanation:

To find the number of moles in a substance when given the molar mass and mass we use the formula

where

n is the number of moles

M is the molar mass

m is the mass of the substance

Mr( Na) = 23 , Mr( CL ) = 35.5

Molar mass ( NaCl ) = 23 + 35.5

= 58.5 g/mol

Mass = 1.005 kg

It's equivalent in grams is

1.005 × 1000 = 1005 g NaCl

So the number of moles in NaCl is

We have the final answer as

17.2 mol to the nearest tenth

Hope this helps you

pie chart because it is in percents ( % )