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Moles & Stoichiometry Whiteboard Review
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What is the gram-formula mass of (NH4)3PO4?
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149.0 g/mol
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What is the gram-formula mass of Ca3(PO4)2 ?
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310.0 g/mol
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What is the mass of 1 mol of Li?
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6.9 g/mol
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What is the total mass of 2.0 moles of H2 (g)?
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4.0 g
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How many moles are in 39 grams of LiF?
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1.5 moles
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What is the percent composition by mass of nitrogen in (NH4)2CO3?
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29.2%
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Which of the following compounds has the smallest percent composition by mass of chlorine?
a) HCl b) KCl c) LiCl d) NaCl
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KCl
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What is the molecular formula of a compound that has a molecular mass of 92 and an empirical formula of NO2?
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N2O4
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Vitamin C has an empirical formula of C3H4O3 and a molecular mass of 176. What is the molecular formula of Vitamin C?
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C6H8O6
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Given the balanced equation representing a reaction:
F2(g) + H2(g) 2HF(g) What is the mole ratio of H2(g) to HF(g) in this reaction?
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1:2
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Given the balanced equation:
2C + 3H2 C2H6 What is the total number of moles of C that must completely react to produce 2.0 moles of C2H6?
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4.0 mol
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Given the reaction: 6 CO2 + 6H2O C6H12O6 + 6O2 What is the total number of moles of water needed to make 2.5 moles of C6H12O6?
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15 mol
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Given the compound C4H10O8, a) Calculate the molar mass of the compound. b) Calculate the number of moles in 17.7 grams of the compound. c) What is the empirical formula for this compound?
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a) 186 grams b) .095 moles c) C2H5O4
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Gypsum is a mineral that is used in the construction industry to make drywall (sheetrock). The chemical formula for this hydrated compound is CaSO4・2H2O. Calculate the gram formula mass of gypsum.
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172.2 g/mol
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Gypsum is a mineral that is used in the construction industry to make drywall (sheetrock). The chemical formula for this hydrated compound is CaSO4・2H2O. Calculate the percent composition by mass of water in gypsum.
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20.9%
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Given the reaction: N2 + 3 H2 2 NH3 How many grams of ammonia are produced when 1.0 mole of nitrogen reacts?
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34 grams
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A student obtained the following data to determine the percent by mass of water in a hydrate. What is the approximate percent by mass of the water in the hydrated salt?
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12%
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Balance the equation below, using the smallest whole-number coefficients.
____ Al (s) + ____ CuSO4 (aq) ____ Al2(SO4)3 (aq) + ____ Cu (s)
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2 Al (s) + 3 CuSO4 (aq) Al2(SO4)3 (aq) + 3 Cu (s)
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Name the following compound: CuSO4
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copper (II) sulfate
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How many grams of Al2(SO4)3 does this represent?
2 Al (s) + 3 CuSO4 (aq) Al2(SO4)3 (aq) + 3 Cu (s) According to the balanced equation above, if 1.6 moles of CuSO4 react completely, how many moles of Al2(SO4)3 will be produced? How many grams of Al2(SO4)3 does this represent?
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0.5 moles 171.0 g
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