Propane is a common fuel used for portable stoves. if a gas canister contains 0.283 dm^3 of propane, what is the maximum heat it can produce? (density of propane is 0.493 g/mL) C3H8(g) + 5 O2(g) -> 3 CO2(g) + 4 H2O(g)
delta H = -2221 kJ/mol

If 1.8 l of water is added to 2.5l of a 7.0 molarity koh solution, what is the molarity of the new solution

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?