Copper has a specific heat capacity of 0.385 J/g˚C. A piece of copper releases 5000.0 Joules of energy when it is cooled from 230˚C to 110˚C. What is the mass of the piece of copper? please show your work.

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.