Which of the following helps reduce the flow of thermal energy from within your house to the outside? A.) High efficiency appliances
B.) Attic insulation
C.) Use of solar energy instead of fossil fuels

Should be B. It is talking about reducing thermal energy from transferring, so insulation is the only thing that helps. High efficiency appliances saves you electricity, and C is talking about renewable energy.

s too much pool water may lead to chlorine poisoning. the concentration of chlorine in public drinking water is extremely low and not harmful to human health. sooo yeahh

explanation:

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%