What is the total mass of 2.0 moles of H2?

4.032 g

Explanation:

2.0 moles = X g / 1.008 * 2 g

4.032 g

not sure thu

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.

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i think? ?