A chemist mixes 77.g of diethyl ether with 99.g of methanol and 93.g of 4-methyl-2-pentanone. Calculate the percent by mass of each component of this solution. Be sure each of your answer entries has the correct number of significant digits.

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

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?

Which of the following is a conclusion that resulted from ernest rutherford’s scattering experiment? (will mark brainliest) a. the nucleus is negatively charged b. the atom is a dense solid and is indivisible c. the mass is conserved when atoms react chemically d. the nucleus is very small and the atom is mostly empty space