Consider the double-replacement reaction below. Ba(HCO3)2 + ______ + ______ of the following would you expect to be one of the products for this reaction? A. BaFe B. SO4Ba C. FeBa D. Fe(HCO3)2 Unit 8: Chemical Composition What is the percent composition of carbon in Na2CO3 ? 12.01 g C x 100 = 11.33 % C . 105.99 g total What is the empirical formula of a compound that is 74.8% C and 25.2% H ? 74.8% C 74.8 g C x 1 mol C = 6.23 mol C ÷ 6.23 = 1 C 12.01 g C 25.2% H 25.2 g H x 1 mol H = 24.9 mol H ÷ 6.23 = 4 H 1.01 g H What is the empirical formula of a compound that is 36.84% N and 63.16% O by mass? 36.84% N 36.84 g N x 1 mol N = 2.630 mol N ÷ 2.630 = 1 N x 2 = 2 N 14.01 g N 63.16% O 63.16 g O x 1 mol O = 3.948 mol O ÷ 2.630 = 1.5 O x 2 = 3 O 16.00 g O A compound has an empirical formula of CH2 and a molecular weight of about 56 g/mol. What is the molecular formula of the compound? molecular mass = multiple 56 = 4 4(CH2) = C4H8 empirical mass 14.03 A certain compound has an empirical formula of and a molecular weight of about 44 g/mol. What is the molecular formula of this molecule?
Consider the double-replacement reaction below. Ba(HCO3)2 + ______ + ______ of the following would you expect to be one of the products for this reaction? A. BaFe B. SO4Ba C. FeBa D. Fe(HCO3)2 Unit 8: Chemical Composition What is the percent composition of carbon in Na2CO3 ? 12.01 g C . x 100 = 11.33 % C 105.99 g total What is the empirical formula of a compound that is 74.8% C and 25.2% H ? 74.8% C 74.8 g C x 1 mol C = 6.23 mol C ÷ 6.23 = 1 C 12.01 g C 25.2% H 25.2 g H x 1 mol H = 24.9 mol H ÷ 6.23 = 4 H 1.01 g H What is the empirical formula of a compound that is 36.84% N and 63.16% O by mass? 36.84% N 36.84 g N x 1 mol N = 2.630 mol N ÷ 2.630 = 1 N x 2 = 2 N 14.01 g N 63.16% O 63.16 g O x 1 mol O = 3.948 mol O ÷ 2.630 = 1.5 O x 2 = 3 O 16.00 g O A compound has an empirical formula of CH2 and a molecular weight of about 56 g/mol. What is the molecular formula of the compound? molecular mass = multiple 56 = 4 4(CH2) = C4H8 empirical mass 14.03 A certain compound has an empirical formula of and a molecular weight of about 44 g/mol. What is the molecular formula of this molecule?
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