Question $2$

$[25]$

$2($a$)$ Compound A has a percent composition of $75\mathrm{.}95\%C,17\mathrm{.}72\%N,$ and $6\mathrm{.}33\%H$ by mass with a molar mass of about $240\frac{g}{m}ol.$

$($i$)$ Determine the molecular formula of Compound $A$

$($ii$)$ What is the empirical formula of Compound $A$

$2($b$)$ Calculate the molarity of a $1\mathrm{.}05mL$ solution prepared by dissolving $0\mathrm{.}000889g$ of glycine, $C_2{H}_{5}N{O}_2.$

$2($c$)$ Predict which of the following compounds are ionic and which are covalent, based on the position of the elements in the periodic table.

$($i$)NC{l}_3$

$($ii$)CoB{r}_2$

$($iii$)K_{2}S$

$($iv$)CO$