Methane combusts according to the following thermochemical equation: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -891 kJ

If 25 g of methane combusts, how much energy is released in the reaction?
(Show all work and answer with the correct significant figures and units.)

What type of matter is made of only one kind of atom

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j

How are isotopes of the same element alike?