Question

the mass of 1.5*10^20 molecules of a substance is 20 mg the molar mass of the substance is ​

Answer 1

Answer:

80.3 gram

Explanation:

1.5x10²⁰ molecules = 20 mg

1 molecule = 20/1.5x10²⁰ mg = 1.333333x10^ -19 mg

6.022x10²³ molcules = 1.333333x10^ -19 x 6.022x10²³ mg

= 80293.33333 mg

= 80.29 gram( approx )

= 80.3 gram ( it may be BROMINE )

Answer 2

Answer:

80g

Explanation:

1.5 * 10^20 molecules------> 20 mg

6.022 * 10^23 molecules------>$\frac{1.5 * 10power20}{20}$* 6.022* 10^23

                                                  =80g