Calculate the ratio by mass of nitrogen and hydrogen in (i) ammonia ((NH₃)), (ii) carbon dioxide ((CO₂)), (iii) water ((H₂O)), (iv) calcium oxide ((CaO)).
a) (i) 14:3, (ii) 14:11, (iii) 1:1, (iv) 14:8
b) (i) 3:14, (ii) 11:14, (iii) 1:2, (iv) 8:14
c) (i) 3:14, (ii) 14:11, (iii) 1:2, (iv) 14:8
d) (i) 14:3, (ii) 11:14, (iii) 2:1, (iv) 14:8
