When 1.20 moles c react with 1.20 moles o2, 2.40 moles co2 are obtained. a. true b. false?

False. It would be just 1.20 moles of CO2 made.

To determine the amount of heat needed to evaporate a certain amount of water at its boiling point, we use the equation,

                  H = m(Hv)

where H is the heat, m is the mass (in grams), and Hv is the latent heat of vaporization. Substituting the known values,

                 H = (105 g)(540 cal/g)

                  H = 56700 cal

                H = 56.7 kcal

56.7 kcal