Mastering Molecular Weights - problems and video-solutions

Mastering Molecular Weights - problems and video-solutions...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: nanni (arn437) Mastering Molecular Weights - problems and video CNS (87654) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The molecular formula for strontium oxide is SrO. A chemist decomposes strontium car- bonate to make 24.7 grams of strontium oxide. How many moles of SrO are made? Correct answer: 0 . 24 moles. Explanation: Find the molecular weight of SrO, and then divide the mass of SrO by the molecular weight to find the number of moles. MW SrO = MW Sr + MW O = 87 . 62 g / mol + 15 . 999 g / mol = 103 . 619 g / mol Thus, the number of moles is moles = 24 . 7g parenleftbigg 1mol MW SrO parenrightbigg = 24 . 7g parenleftbigg 1mol 103 . 619g parenrightbigg = 0 . 238373 mol = 0 . 24 moles 002 10.0 points Chlorine is a toxic gas that irritates the respi- ratory system. How many moles of chlorine is there in 11.5 grams?...
View Full Document

Ask a homework question - tutors are online