Atoms are made up of subatomic particles. Which of the following
statements is true about subatomic particles? *
A)Electrons are negatively charged and are the heaviest subatomic particle.
B) Neutrons are completely responsible for the mass of the nucleus and have no charge.
C) The mass of a neutron nearly equals the mass of a proton.
D) Protons are positively charged and the lightest subatomic particle.

The combustion of methane, ch4, releases 890.4kj/mol. that is, when one mole of methane is burned,890.4 kj are given off to the surroundings. this meansthat the products have 890.4 kj less than the reactants.thus, ah for the reaction = - 890.4 kj. a negative symbolforah indicates an exothermic reaction.ch (g) + 20 (g)> co2 (g) + 2 h0 (1); ah = - 890.4 kga) how much energy is given off when 2.00 mol of ch,are burned? b) how much energy is released when 22.4g of ch. areburned?