Question

calculate the mass of 0.2 moles of sodium atoms ​

Answer 1

Answer:

Now you have to find the mass (m).

The mass of sodium is:

[m = 23.0 g/mol  ×  .2 moles] = 4.60 grams of sodium is present in .2 moles

Explanation:

Assume that:

n = number of moles

m = mass of substance

M = molar mass (equivalent to atomic weight on the periodic table)

n = m / M

.2 moles (n) has been given to you.

The next step is to find the molar mass (M) of Na. If you refer to your periodic table, the molar mass of Na (sodium) is 23.0 g/mol.

Answer 2

Explanation:

You have to find the mass

so,

n=m/M

n=0.2

M=23

m=?

0.2=m/23

m=0.2×23= 4.6

m=4.6