If 16.8 g of substance XY contains 3.4 g of X, what is the mass percentage of Y?

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

In an effort to address concerns about global warming, a power plant in portland,oregon is designed to take all of its exhaust gases from its boilers and recycle the co2 using the solvay process to make sodium hydrogen carbonate. the reaction is shown below. nh3(g) + h2o(l) + co2(g) + nacl(aq) → nahco3(aq) + nh4cl(aq) how many liters each of nh3 and co2 (both at stp) would be consumed to produce 3.00 kg of sodium bicarbonate? the volume of both nh3 and co2 would be

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true