Question

Titanium (IV) oxide is the main pigment in white and other light – colored paints. How many grams of titanium(IV) oxide (80) will produce from 18.0 g of oxygen (16) react with Ti to form titanium(IV) oxide?

Answer 1

Since the molecular mass of oxygen is given as 16, It is assumed that oxygen is atomic. If the assumption is wrong, divide the final answer by 2. $Ti + 2O \rightarrow TiO_2$

$n= m/M$

$M(O) = 16\frac{g}{mol}$

$M(TiO_2) = 80\frac{g}{mol}$

$n(O) = n(TiO_2) =\frac {18\ g }{16\frac{g}{mol}} = 1. 125 \ mol$

$m = n*M$

$m(TiO_2) = 1.125\ mol * 80\frac{g}{mol} =90\ g$

Answer: $m(TiO_2) = 90\ g$