The mass of vitamin d in your blood is 50.0 grams. what is this measure in pounds? (answer in scientific notation)

1.10231×10-1 lb

Explanation:

we know that one gram is equal to the 0.00220462 lb or we can say that one pound is equal to the 453.592 g.

we have to convert the 50.0 g into pounds:

m (lb)= m(g)× 0.00220462

m(lb)=50×0.00220462

m(lb)=0.110231

in scientific notation:

1.10231×10-1 lb

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)