Question

find moles and weight in gram : 25×10^22 molecules of HCl​

Answer 1

1 mole= 6.022× 10^23 (molecules, ions , atoms etc.)

Therefore,

No. of moles in HCl = 2.5×10^23 / 6.022×10^23

= 0.415 moles

Weight in grams,

Weight of 1 molecule of HCl = 1+35.5=36.5u

Now,

0.415×36.5= 15.1475 grams