Question

find out the number of moles in 20g of Helium​

Answer 1

Explanation:

There are 5.00 moles He in 20.0 g He.

Explanation:

In order to determine the number of moles of a given mass of a substance, divide the given mass by its molar mass.

The molar mass of helium is

4.0026 g/mol

(atomic mass from the periodic table in g/mol).

20.0

g He

×

1

mol He

4.0026

g He

=

5.00 mol He

rounded to three significant figures

Answer 2

Answer:

There are 5.00 moles He in 20.0 g He.

Explanation:

Pls Mark It Brainliest