This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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To determine the formula mass, we sum the atomic masses of all atoms in the chemical formula. We will use the following approximate atomic masses: N = 14.01 g/mol H = 1.01 g/mol Cl = 35.45 g/mol Na = 22.99 g/mol C = 12.01 g/mol O = 16.00 g/mol Fe = 55.85 g/mol Al = 26.98 g/mol S = 32.07 g/mol a) NH_4Cl Step 1: Identify the number of atoms for each element. 1 nitrogen (N) atom, 4 hydrogen (H) atoms, 1 chlorine (Cl) atom. Step 2: Calculate the total mass. Formula mass = (1 × 14.01) + (4 × 1.01) + (1 × 35.45) Formula mass = 14.01 + 4.04 + 35.45 Formula mass = 53.50 g/mol The formula mass of NH_4Cl is 53.50 g/mol. b) NaHCO_3 Step 1: Identify the number of atoms for each element. 1 sodium (Na) atom, 1 hydrogen (H) atom, 1 carbon (C) atom, 3 oxygen (O) atoms. Step 2: Calculate the total mass. Formula mass = (1 × 22.99) + (1 × 1.01) + (1 × 12.01) + (3 × 16.00) Formula mass = 22.99 + 1.01 + 12.01 + 48.00 Formula mass = 84.01 g/mol The formula mass of NaHCO_3 is 84.01 g/mol. c) FeCl_3 Step 1: Identify the number of atoms for each element. 1 iron (Fe) atom, 3 chlorine (Cl) atoms. Step 2: Calculate the total mass. Formula mass = (1 × 55.85) + (3 × 35.45) Formula mass = 55.85 + 106.35 Formula mass = 162.20 g/mol The formula mass of FeCl_3 is 162.20 g/mol. d) C_2H_5OH Step 1: Identify the number of atoms for each element. 2 carbon (C) atoms, 6 hydrogen (H) atoms (5 in C_2H_5 and 1 in OH), 1 oxygen (O) atom. Step 2: Calculate the total mass. Formula mass = (2 × 12.01) + (6 × 1.01) + (1 × 16.00) Formula mass = 24.02 + 6.06 + 16.00 Formula mass = 46.08 g/mol The formula mass of C_2H_5OH is 46.08 g/mol. e) Al_2(SO_4)_3 Step 1: Identify the number of atoms for each element. 2 aluminium (Al) atoms, 3 sulfur (S) atoms (from 3 × S), 12 oxygen (O) atoms (from 3 × 4 × O). Step 2: Calculate the total mass. Formula mass = (2 × 26.98) + (3 × 32.07) + (12 × 16.00) Formula mass = 53.96 + 96.21 + 192.00 Formula mass = 342.17 g/mol The formula mass of Al_2(SO_4)_3 is 342.17 g/mol. Send me the next one 📸