Question

Calculate the number of molecules present in 136 g of Hydrogen sulphide (H2S).

Answer 1

Answer:

N = 24.088  × 10²³

Step-by-step explanation:

Number of molecules = N =?

given mass = m = 136g

Molar mass = M =  34.1 g or 34g

number of moles = m/M  

number of moles = N/ No

∴ N =  m/M × No

N =  136/34 × 6.022 × 10²³

N = 4 × 6.022 × 10²³

∴ N = 24.088  × 10²³