What is the empirical formula for a compound with 141% carbon 2.4% hydrogen, and 83.5% chlorine?

In pqr m< p=60 m< q= 30 and m

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

What is the mass of 0.750 mole of aluminum oxide, al2o3?