1.You have sample of 269.16 grams of water which contains 29.91 g of Hydrogen and 239.25 g of Oxygen. Calculate the % Composition of H and O.

2.What is the mass ratio of this sample of water?
sample of 150.00 grams of NaCl is composed of 60.00 g of Na and 90.00 g of Cl
239.25 g of Oxygen.
Calculate the % Composition of H and O.

3.The formula for Ibuprofen (C13H18O2) contains 75.69% carbon, 8.80% hydrogen, and 15.51% oxygen.
How many grams of each element does a 2.00 gram Ibuprofen tablet contain?

Idon’t know what the answer is i wish i could

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  c.sending the first human into space4. which of these space missions involved the deployment of lunar roversa. voyager 15. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar  systemb.safir7.which technology limit the future of space explorationb. scientist must first develop certain technologies before missions can be completed.