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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Here are the solutions to your chemistry problems: 3. Calculate the mass in 3 moles of NH_4OH Step 1: Identify the atomic masses of each element. • Nitrogen (N): 14.01 \, g/mol • Hydrogen (H): 1.01 \, g/mol • Oxygen (O): 16.00 \, g/mol Step 2: Calculate the molar mass of NH_4OH. The formula indicates 1 N atom, 5 H atoms (4 from NH_4 and 1 from OH), and 1 O atom. Molar mass of NH_4OH = (1 × N) + (5 × H) + (1 × O) Molar mass = (1 × 14.01 \, g/mol) + (5 × 1.01 \, g/mol) + (1 × 16.00 \, g/mol) Molar mass = 14.01 \, g/mol + 5.05 \, g/mol + 16.00 \, g/mol Molar mass = 35.06 \, g/mol Step 3: Calculate the mass using the number of moles and molar mass. The formula for mass (m) is: m = moles (n) × molar mass (M) m = 3 \, mol × 35.06 \, g/mol m = 105.18 \, g The mass in 3 moles of NH_4OH is 105.18 g. 4. Calculate the mass in 4.2 moles of Ca(NO_3)_2 Step 1: Identify the atomic masses of each element. • Calcium (Ca): 40.08 \, g/mol • Nitrogen (N): 14.01 \, g/mol • Oxygen (O): 16.00 \, g/mol Step 2: Calculate the molar mass of Ca(NO_3)_2. The formula indicates 1 Ca atom, 2 N atoms (from 2 × NO_3), and 6 O atoms (from 2 × 3 O). Molar mass of Ca(NO_3)_2 = (1 × Ca) + (2 × N) + (6 × O) Molar mass = (1 × 40.08 \, g/mol) + (2 × 14.01 \, g/mol) + (6 × 16.00 \, g/mol) Molar mass = 40.08 \, g/mol + 28.02 \, g/mol + 96.00 \, g/mol Molar mass = 164.10 \, g/mol Step 3: Calculate the mass using the number of moles and molar mass. m = moles (n) × molar mass (M) m = 4.2 \, mol × 164.10 \, g/mol m = 689.22 \, g The mass in 4.2 moles of Ca(NO_3)_2 is 689.22 g. 3 done, 2 left today. You're making progress.