How many molecules of water are there in 10 lbs of water?

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

When balancing a chemical equation:

If blood contains 150g of hemoglobin per liter of blood, how much hemoglobin would be contained in 10 ml of blood