Molar Mass Percent

Molar Mass Percent - CHEM 1201 SI Worksheet 8 THC is the...

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CHEM 1201 SI Worksheet Mole, Molar Mass Mole (n) – the amount of substance that contains as many “building blocks” of that substance. There are 6.022 × 10 23 atoms (or molecules, formula units) in one mole of a substance. Molar Mass (M M ) – mass (in grams) of 1 mole of a substance. For elements, M M is numerically equal to the atomic mass, but amu units are replaced by grams per mol . FORMULA: 1. How many atoms of C would be found in 0.132 mole of C? 2. What is the mass of 0.700 mol of Mg? 3. What portion of a mole is contained in 6.11 × 10 -2 g of Na? 4. How many moles of C are there in 84.12 g of C? 5. How many moles of H 2 O are there in 3.52 × 10 2 g of H 2 O? 6. Find the number of molecules of bromine gas in 0.079 moles of Br 2 . 7. What is the identity of an element if 0.55 moles of it has a mass of 12.649 g?
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Unformatted text preview: CHEM 1201 SI Worksheet 8. THC is the drug found in marijuana that acts on receptors on the human brain. Neil Young wants to know many carbon atoms there are in 360 molecules of THC, C 21 H 30 O 2 ? Can you help him out? 9. Which of the following contains the largest number of atoms? a) 5 g of strontium b) 5 g of sodium c) 5 g of potassium d) 5 g of vanadium e) 5 g of chromium 10. What is the identity of an element if 0.424 moles of it weigh 6.78 g? Percent Composition: ±²²³´³µ¶³·¸· ·¹º³»³¼¹³±³½µ ¾µ¿¹À = ÁÂÃóÄųÆÇÆÁÆÈÉ³Ê ÁÂÃóÄų˳ÁÄÇƳÄųÌÄÁÍÄÎÈÏ × 100% 1. What is the mass % of H in ammonia, NH 3 ? 2. Using the percentage you found in question 1, find the mass of H in 75 g of ammonia....
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This note was uploaded on 03/21/2011 for the course CHEM 1201 taught by Professor Cook during the Fall '08 term at LSU.

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Molar Mass Percent - CHEM 1201 SI Worksheet 8 THC is the...

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