In stoichiometry, is every chemical reaction classified as either endothermic or exothermic based on the heat of reaction?

How many grams of Mg(OH)2 are required to completely neutralize 20 mL of 0.1 M HCl?

Determine the number of grams of H2 formed when 250.0 mL of 0.743 M HCl solution reacts with 3.41 x 10^23 atoms of Fe according to the following reaction: 2 HCl(aq) + Fe(s) → H2(g) + FeCl2(aq).

Determine the theoretical yield of H2S (in moles) if 48 mol Al2S3 and 48 mol H2O are reacted according to the following balanced reaction: Al2S3(s) + 6 H2O(l) → 2 Al(OH)3(s) + 3 H2S(g).

Which of the following is the balanced chemical equation for the formation of calcium nitrate, Ca(NO3)2(s), from its respective elements in their standard states?

What is the mass of Fe₂O₃ required to produce 930 kg of iron (Fe) in the reaction: Fe₂O₃ + 3CO → 2Fe + 3CO₂?

For the reaction 3A + 2B + C → 2D, if 5.7 mol of A, 3.2 mol of B, and 2.5 mol of C are mixed, which reactant is the limiting reactant?

For the reaction 4Al(s) + 3O₂(g) → 2Al₂O₃(s), if you start with 8 moles of Al and 6 moles of O₂, what is the limiting reactant?

Given the balanced equation N2(g) + 3 H2(g) → 2 NH3(g), what is the rate of reaction with respect to [NH3] if the rate of disappearance of H2 is 0.6 mol/L·s?