Question

5. In a reaction : N2(g) + 3H2(g) 2NH3(g),2000g N2 reacts with 100g
H2 which reactant will left unreacted ? How much?
O 0) N2, 2428 g
(ii) H2, 428.6 g
(iii) N2, 571.49
O (iv) H2,571.49

Answer 1

Answer:

The quantity of molecules is measured by moles. Every substance has its molar mass, or grams per mole.

An atom consists of protons, neutrons and electrons. With the electrons weight negligible, a rough way to deduce the molar mass of a substance is to count the number of protons and neutrons of all atoms per molecule.

For instance, hydrogen molecule H2 has 2 protons, hence the molar mass is 2 g/mol. 10g of hydrogen has 5 moles of H2 molecules.

Each mole = 6.02x10^23

Hence, 5 x 6.02 x 10^23 gives 30.1 x 10^23