What is the formula mass of 2-butene, $C_4H_8$ ?

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Answer 1 · 2017-03-11T16:35:25

$M_r(C_4H_8)=56$

$M_a(C) = 12$
$M_a(H) = 1$

$M_r(C_4) = 12 * 4 = 48$
$M_r(H_8) = 1 * 8 = 8$

$M_r(C_4H_8) = 48 + 8 = 56$
$M_r(C_4H_8)=56$

What is the formula mass of 2-butene, C_4H_8C_4H_8?