Ionic bonds involve the transfer of electrons from metal to non metal

covalent bonds involve sharing of electrons between two non metal

**Empirical formula = mol ratio**

mol H = 9.42 x 10²⁴ : 6.02 x 10²³ = 15.648

mol N = 3/9 x 15.648 = 5.216

mass N = 5.216 x 14 g/mol =**73.024 g**

**Answer: 85 minutes**

**Explanation:**

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

Half life for second order kinetics is given by:

= half life = 15 min

k = rate constant =?

= initial concentration = 100 (say)

Integrated rate law for second order kinetics is given by:

a= concentration left after time t =

**Thus after 85 minutes after the start of the reaction, it will be 85% complete.**

**Answer**

**2.1 x 10 ^23**

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