Question

Calculate the mass
${10}^{20}$
Molecules of
$so_{2}$
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Answer 1

Explanation:

Formula unit mass of Na

2

CO

3

= 2×atomic mass of Na+1×atomic mass of C+3×atomic mass of O

=2×22.98+1×12.01+3×16

=105.97u

Formula unit mass of 10H

2

O=10×atomic mass of H

2

O

=10×18.02

=180.02u

Formula unit mass of Na

2

CO

3

.10H

2

O=105.97+180.02

=285.99u