Heat
Quiz
Active
TIME REMAINI
54:36
Two samples of carbon come into contact. A heat transfer will occur between sample A and sample B. What must be true for
heat to transfer from sample A to sample B?
O
O
O
O
The average kinetic energy of A is greater than that of B
The average kinetic energy of B is greater than that of A.
The verage kinetic energy of both samples is equal
The average kinetic energy does not determine the direction of heat transfer.

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%