Introducing chemical reactions

Easy

What is the relative formula mass of sodium bromide, $NaBr\text{NaBr}$ ?

Relative atomic mass ( $ArA_{\text{r}}$ ): $Na=23.0\text{Na} = 23.0$ $Br=79.9\text{Br} = 79.9$

$56.9$

$102.9$

$125.9$

$159.8$

Introducing chemical reactions Questions