Ok so you have $685 plus an extra $85 for the installation. You have a total of $770. You divide this by two to find per year. It is $385 per year. Now divide that by twelve for the monthly cost and you get $32.08
The answer would be the letter D
We are given a compound known to be Sodium Bromine (NaBr). This compound has a molecular weight of
Na=23 g/mol and Br=80 g/mol
NaBr=23+80= 103 g/mol
Assuming if we have 1 mol of NaBr, then we have 80 g of Bromine (Br). Calculating its percent composition in the total NaBr compound, we get
%Br= (80/103)*100=77.7%
Therefore, the answer to the question above is letter A.
