How many grams of h2 would be formed if 34 grams of carbon reacted with an unlimited amount of h2o? the reaction is:

c + h2o → co + h2

the atomic mass of c is 12.01 g/mole. the atomic mass of h2 is 2.016 g/mole. finish the problem by choosing the correct format for dimensional analysis.

Since H2O is excess, C is limiting reagent and it will decide the amount of H2 formed. Moles of C = 34/12.01 = 2.83. According to stoichiometry, moles of C = moles of H2. Therefore, moles of H2 = 2.83. Mass of H2 formed = moles of H2 formed x molar mass of H2 = 2.83 x 2.016 = 5.70528 grams. 

Exothermic,  physical change after it is already baked