The standard enthalpy of formation of Ca2+ (g) (∆H = 1934 kJ/mol) The first ionization of Ca H=590 kJ/mol
The second ionization of Ca H=1151 kJ/mol
I need to write an equation for the process of the standard enthalpy of formation of Ca2+. Can you help and explain please?

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.