A 0.45g sample of mineral ore is analised for chromium and found to contain 0.560mg Cr2O3. Express the concentration of Cr2O3 in the sample as a) percent B)parts the thousands C)parts per million D) parts per billion

Problem page gaseous ethane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . if of water is produced from the reaction of of ethane and of oxygen gas, calculate the percent yield of water. be sure your answer has the correct number of significant digits in it.

How many miles of water are produced if 5.43 mol pbo2 are consumed

What is i fracture in the crust called when land move up, down or sideways