How much heat is released if excess calcium carbonate reacts with 48.9 mL of 0.668 M HCl(aq)? CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) ΔrxnH° = –15.2 kJ/mol

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

Why does his teacher ask him to balance the equation by including the correct coefficient

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.