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Practice Working with Moles - problems and videos-solutions

Practice Working with Moles - problems and videos-solutions...

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Unformatted text preview: nanni (arn437) – Practice Working with Moles - problems and videos – CNS – (87654) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Several gemstones, including the emerald, contain the alkali earth metal beryllium. How many grams of beryllium are there in 1.94 moles of beryllium? Correct answer: 17 . 48 g. Explanation: mass = moles parenleftbigg MW Be 1mol parenrightbigg = 1 . 94mol parenleftbigg 9 . 012g mol parenrightbigg = 17 . 4833 g = 17 . 48 g 002 10.0 points Diamond is one of the strongest and most precious materials on earth, and an allotrope of elemental carbon. A carat weighs 200mg. How many moles of carbon are there in a 1 carat diamond? Round to the third decimal place. Correct answer: 0 . 017 mol. Explanation: moles = mass parenleftbigg 1mole MW C parenrightbigg mass = 200 mg parenleftbigg 1g 1000mg parenrightbigg moles = 0 . 2 g parenleftbigg mol 12 . 011 g...
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