Which statement about distinguishing an ionic compound from a covalent compound by its formula is true? a. it is impossible to tell from the formula. b. it is determined by the presence of subscripts. c. knowing the presence of pluses and minuses determines the difference. d. knowing the total number of atomic particles makes it possible.

One of the hopes for solving the world's energy problem is to make use of the fusion reaction 21h +31h --> 42he + 10n + energy how much energy is released when 1 mol of deuterium is fused with 1 mol of tritium according to the above reaction? the masses of the atoms and the neutrons are as follows: 21h = 2.0140 amu 31h = 3.01605 amu 42he = 4.002603 amu 10n = 1.008665 amu. the speed of light is 2.9979 x 108 m/s.