Consider a chessboard, which has a total of 64 squares. One grain of wheat is placed on the 1st square, 2 on the 2nd square, 4 grains on the 3rd square and 8 grains on the 4th square and so on...

How many grains of wheat will be placed on square number 28?

134217728

Assuming that each grain of wheat weighs 1/7000 pounds, what will be the total wight (in pounds) of grains on the entire chessboard when 28 squares are filled?

(I can't figure out the weight part in this question)