In the first case we can calculate the Mass of oxygen used =1.510g-0.910g
For the second question;
2Mg+O2→2MgO
now moles of magnesium oxide =2(24+16)0.850=0.0106
mole ratio; 2Mg:2MgO=2:2=1:1
moles of Mg=0.0106
mass of magnesium=48×0.0106=0.5088g
For the next question;
2Mg+O2→2MgO
mass of magnesium oxide =2(24+16)2.55=0.031875
mole ratio 2MgO:2Mg=2:2=1:1
mass of Mg =2×24×0.031875=1.53g
mass of oxygen=2.55g-1.53g=1.02g
Comments
Leave a comment