chemistryyyy ughhh helpppp mee pleaseeee!?

chemistryyyy ughhh helpppp mee pleaseeee!?

1.
A) when a 4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature dorps from 22.0C TO 16.9 c. calculate q for the solution process
NH4NO3(s) –> NH4+ (aq) + NO3- (aq)
Assume that the specific heat of the solution is 4.814J/(G C).

B) is this process endothermic or exothermic

2.From the enthalpies of reaction
2C(s) + O2(g) –> 2CO(g) enthalpy H= -221.0kJ
2C(s) + O2(g) +4H2(g)–>2CH3OH(g) enthalpy H= -402.4kJ
Calculate enthalpy H for the reaction
CO(g) + 2H2(g) –> CH3OH(g) enthalpy H = ?

3.
A) A red laser pointer emits light with a wavelength of 650 nm. what is the frequency of this light?
B) What is the energy of one of these photons?