Question

The following data are obtained when dinitrogen and dioxygen react together to form different compounds.

Mass of dinitrogen	Mass of dioxygen
14 g	16 g
14 g	32 g
28 g	32 g
28 g	80 g

Which law of chemical combination is obeyed by the above experimental data?

• A. Law of conservation of mass

• B. Law of definite proportions

• C. Law of multiple proportions
• D. Avogadro’s law

Answer 1

Answer: (A)

Law of conservation of mass

Answer 2

(1) : $\underset{100g}{CaCO_{3}} + \underset{2 \times 36.5 = 73g}{2HCl \rightarrow}CaCl_{2} + H_{2}O + CO_{2}$

100 g of $CaCO_{3}$requires 73 g of HCl

$\therefore$50 g of $CaCO_{3}$requires $\frac{73}{100} \times 50 = 36.5g$of HCl