A reaction occurs between 6 molecules of H2 and four molecules of O2 to form 6 molecules of H2O, in which one molecule of oxygen is left over:

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?