Question

How many moles of $NaHC{O}_3$ are present in 420 g of $NaHC{O}_3$?

• A. 8
• B. 10
• C. 5
• D. 2

Answer 1

The correct option is C

5

Given mass of $NaHC{O}_3$= 420 g

Gram molecular mass of $NaHC{O}_3$= 84 g

Number of moles= $\frac{Givenmass}{Grammolecularmass}$

After inserting the given values in the above equation we have:

= $\frac{420}{84}$= $5$ moles

Therefore, number of moles present in 500 g of $NaHC{O}_3$ is 5.