Name any two chemical required for preparation of ammonia gas

What is the molar mass of a gas that has density of 2.054 g/l

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium

In an exothermic reaction, energy may be released to the surroundings in the form of question 4 options: heat light thermal all of the above