Formaldehyde (CH2O) is made up of carbon, hydrogen, and oxygen. It is 40.0 % carbon by mass and 53.3% oxygen by mass. If the remainder is hydrogen only, then find the mass percentage for hydrogen in formaldehyde. Then, find the mass of each of the three elements in 7.55 g of formaldehyde. Show all of your equations, including all of the units and conversion factors. 40.0%+53.3%=93.3%

Will give brainliest it is a lab from k12 here is the linkfor each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. type your answer here. (score for question 3: of 5 points) were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. type your answer here. (score for question 4: of 5 points) make a general statement about the reactivity of the metals in this experiment. type your answer here.

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg