The specific heat of nitric oxide is 0.746 J/gºC. How many joules of heat are needed to
raise the temperature of 90.0 g of nitric oxide from -20 °C to -10 °C?

I don't understand how to get J

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons