How many joules of heat are needed to raise the temperature of 75 grams of water from 15c to 57c?

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

What happens to isotopes that are unstable?