How much NaNO3 can I dissolve in 400 grams of water at 283 K?

Use the standard enthalpies of formation for the reactants and products to solve for the δhrxn for the following reaction. (the δhf of c2h4 is 52.26 kj/mol, co2 is -393.509 kj/mol, and h2o is -241.818 kj.) c2h4 (g) + 3o2(g) 2co2 (g) + 2h2o(g) δhrxn = the reaction is .

What’s the percent by mass of carbon in c10h14n2

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned