Question

the number of molecules in 109.5g of hcl

Answer 1

To calculate no. of molecules we must first calculate the no. of moles.

1 mole of HCl = molar mass of HCl = (1 + 35.5) = 36.5 g/mole

We have 109.5 g of HCl,

No. of moles = 109.536.5= 3 moles

1  mole of any substance has 6.022 x 1023molecules, thus 3 moles will have 3 x (6.022 x1023)
= 1.8066 x 1024 molecules.

Answer 2

heya !!!!


No..of moleculs = no. of moles × NA
= 109.5/ 36.5 × NA

= 3 NA

here ,

NA = 6.02 ×10^23