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Calculate the molecular mass of Ethane $(C_2H_6)$

$\begin{array}{1 1} (a)\; 35.81\;u \\(b)\; 36.51\;u\\ (c)\;20.050\;u \\ (d)\;30.070\;u \end{array} $

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A)
Solution :
Ethane $(C_2H_6)$
Ethane $= C_2H_6+2 \times \text{atomic mass of carbon} + 6 \times \text{atomic mass of Hydrogen}$
$\qquad= 2 \times (12.011u)+6 \times (1.008\;U)$
$\qquad= 24.022\;u +6.048u$
$\qquad= 30.070\;u$
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