Question

Find how many moles of atoms are there in:

1. $7$g of Nitrogen
   
2. $4.6$g of sodium
   
3. $40$g of calcium
   
4. $14$ g of lithium
   
5. $3.2$g of sulphur
   

Answer 1

(a)$7$g of nitrogen

Numbers of moles $=\frac{Givenmass}{Atomicmass}=\frac{7}{14}=0.5$moles

(b) $4.6$g of sodium Numbers of moles $=\frac{Givenmass}{Atomicmass}=\frac{4.6}{23}=0.2$moles

(c) $40$g Calcium

Numbers of moles $=\frac{Givenmass}{Atomicmass}=\frac{40}{40}=1mol$

(d)$14$g of lithium Numbers of moles $=\frac{Givenmass}{Atomicmass}=\frac{14}{7}=2$moles{40}=1$moles

(e)$3.2$g Sulphur

Numbers of moles $=\frac{Givenmass}{Atomicmass}=\frac{3.2}{32}=0.1$moles