Question

calculate;;;;;:::::::::::::;;
pls do this question
URGENT!!!!​

Answer 1

I)

n(N) = 0.5

M(N) = 14 g/mol.

Thus ;

$n = \frac{W}{ M } \\ W \: = M \times n \\ W = 0.5 \times 14 \\ W = 7g$

II)

W(Na) = 46g

M(Na) = 23 g

$n = \frac{W}{ M } \\ n \: = \frac{46}{23 } \\ n = 2 \: moles$

III)

W(H2O) = 20

M(H2O) = 2+16 = 18g/mol.

$n = \frac{W}{ M } \\ n = \frac{20}{18} \\ n = \frac{10}{9} \\ n = 1.11 \: moles$

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