How much heat is released by the combustion of 2 mol of methane?
a.-80.3 kj
b.-802.5 kj
c.-1,605.1 kj
d.-6,420.3 kj

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium