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

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.

The kw for water at 0 °c is 0.12× 10–14 m2. calculate the ph of a neutral aqueous solution at 0 °c.