Tutorial_4-_Mole_Concept.doc

# Iii carbon in the female sex hormone estradiol c 18 h

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(iii) Carbon in the female sex hormone estradiol, C 18 H 24 O 2 (iv) Carbon in capsaicin, C 18 H 27 O 3 , he compound that gives the hot taste to chili peppers. 5. Determine the empirical and molecular formulas of each of the following substances: (i) Caffeine, a stimulant found in coffee that contains 49.5% C, 5.15% H, 28.9% N, and 16.5% O, by mass; molar mass about 195 g/mol (ii) Monosodium glutamate (MSG), a flavour enhancer in certain food that contains 35.5% C, 4.77% H, 37.85% O, 8.29% N, and 13.60% Na; molar mass of 169g/mol. 6. *A compound is known to contain carbon and hydrogen. It might even contain oxygen. A 0.1005 g sample of the compound is burned to produce 0.1159 g H 2 O and 0.2829 g CO 2 . (a)What is the formula of this compound? (b)Calculate the percentage by mass of each element in the compound 7. Calculate the mass of CO 2 produced from the complete combustion of 1.00 g of ethyne, C 2 H 2 . 2C 2 H 2 (g) + 5O 2 (g) → 4CO 2 (g) + 2H 2 O (l) 8. What mass of SiF 4 could be produced by the reaction of 15g of SiO 2 with an excess of HF. SiO 2 + 4HF → SiF 4 + 2H 2 O 9. Calculate the volume occupied by 4.40 g of CO 2 at standard temperature and pressure. 10. Consider the reaction below: CaCO 3 (s) → CO 2 (g) + CaO (s)

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(i) How many moles of CaCO 3 would have to be decomposed to produce 129 g of CaO.
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• Fall '17
• Mr Brown
• Sodium chloride, Sulfuric acid, Sodium hydroxide

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