Вычислите относительные молекулярные массы веществ, формулы которых $P_{2}O_{5}, HI, C_{6}H_{6}, O_{3}, H_{2}S$ и $HNO_{3}$.
$M_{r}$ ($P_{2}O_{5}$) = 2 * $A_{r}$ (P) + 5 * $A_{r}$ (O) = 2 * 31 + 5 * 16 = 142.
$M_{r}$ ($HI$) = 1 * $A_{r}$ (H) + 1 * $A_{r}$ (I) = 1 * 1 + 1 * 127 = 128.
$M_{r}$ ($C_{6}H_{6}$) = 6 * $A_{r}$ (C) + 6 * $A_{r}$ (H) = 6 * 12 + 6 * 1 = 78.
$M_{r}$ ($O_{3}$) = 3 * $A_{r}$ (O) = 3 * 16 = 48.
$M_{r}$ ($H_{2}S$) = 2 * $A_{r}$ (H) + 1 * $A_{r}$ (S) = 2 * 1 + 1 * 32 = 34.
$M_{r}$ ($HNO_{3}$) = 1 * $A_{r}$ (H) + 1 * $A_{r}$ (N) + 3 * $A_{r}$ (O) = 1 * 1 + 1 * 14 + 3 * 16 = 63.
