Question

6.02 x 10^20 molecules of a substance weigh 44 mg. What is the molar mass of the substance?

Answer 1

1 mole contains 6.02 * 10^23 molecules
Thus no. of moles given = (6.02*10^20)/(6.02*10^23) = 0.001
Thus molar mass = (44*10^-3)g / 0.001 = 44g

Answer 2

Answer:

44 g

Explanation:

Given mass = 44 mg = 44/1000 g = 0.044 g

given no. of molecules = 6.02 x 10^20

no. of moles = (6.02 x 10 ^20) / (6.02 x 10^23)[Avogadro's number]

= 1 x 10^ (-3)

= 0.001

no. of moles = given mass / molar mass

=> molar mass = ( 0.004 / 0.001 )g

=> molar mass = 44 g

So, the molar mass is 44g