Calculate the molar mass of the following substances.
Ethyne, `C_2H_2`

Calculate the molar mass of the following substances. Nitric acid, HNO_3

Calculate the molar mass of the following substances. Sulphur molecule, S_8

Calculate the molar mass of the following substances. Hydrochloic acid, HCl

Calculate the molar mass of the following substances. Phosphorus molecule, P_4 (Atomic mass of phosphorus = 31)

Calculate the molarity of each of the following solutions: 30g of Co(NO_3)_2 . 6H_2O in 4.3 L of solution.

Calculate the molarity of each of the following solutions: 30 mL of 0.5 M H_2SO_4 diluted to 500 mL.

Calculate the value of Avogardo Constant from the following data. Density of NaCl = 2.165 gcm^-3 , distance bet^n Na^+ and Cl^- in NaCl = 281 pm (molar mass of NaCl = 58.5 gmol^-1)

Calculate the amount of heat produced when 2kg substance pulled in a floor with a velocity 2m/s in 5 sec.

The standard enthalpy of formation of ammonia is -42.19 kJ. Calculate the heat of the following reaction at constant volume. N_2(g) + 3H_2(g) rarr 2NH_3(g)