AND PLEASE SHOW WORK !
1. Ibuprofen, a common headache remedy, has an empirical formula of C7H9O and a molar mass of approximately 215 g/mol. Find the molecular formula.
2. Determine the empirical formula and molecular formula for a compound composed of 1.04g K, 0.700 g Cr, and 0.86g O. Its molar mass is 388 g/mol.
3. Serotonin is a compound that conducts nerve impulses in the brain. It contains 68.2% C, 6.86% H, 15.9% N, and 9.08% O. Its molar mass is 176 g/mol. What is its empirical formula and molecular formula.

Idont know. if you want an answer you need to give us some context dude.

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.