Respuesta :

rishisharma54321

correct answer will ve:

D. 18 g

Answer:

72 g

Explanation:

formula: n=m/Mr

therefore, by rearranging the formula we can find the answer.

n x Mr = m

Mr(H2O)= (2x1+16)=18

4.0x18=72

hence your answer 72 g

Hope this helps