Calculate the percentage mass of oxgen in water, H2O​

Will mark brainliest 26. which of these statements are true? (3 points) a. gases are compressible b. gases fill their containers completely c. the pressure of a gas is independent of the temperature d. gases have mass e. gases exert pressure f. the pressure of a gas is dependent on the volume g. gas pressure results from the collisions between gas particles h. gases have a definite volume and shape

What is the percent by mass of oxygen in fe2o3

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2