How many grams of Na are present in 30 g of NaOH?

Here are the solutions to the questions: Question 1: How many grams of Na are present in 30 g of NaOH? Step 1: Determine the molar mass of NaOH. The atomic mass of Na is 22.99 g/mol. The atomic mass of O is 16.00 g/mol. The atomic mass of H is 1.01 g/mol. Molar mass of NaOH = 22.99 + 16.00 + 1.01 = 40.00 g/mol Step 2: Calculate the number of moles of NaOH in 30 g. Moles of NaOH = 30 g40.00 g/mol = 0.75 mol Step 3: Determine the moles of Na in 0.75 mol of NaOH. From the chemical formula NaOH, there is 1 mole of Na for every 1 mole of NaOH. Therefore, moles of Na = 0.75 mol. Step 4: Calculate the mass of Na. Mass of Na = 0.75 mol × 22.99 g/mol = 17.2425 g The closest option is C. The final answer is C. 17 g. --- Question 2: How many liters of H_2 can be produced by the decomposition of 3 moles of NH_3, at STP? Step 1: Write the balanced chemical equation for the decomposition of NH_3. 2NH_3(g) → N_2(g) + 3H_2(g) Step 2: Use stoichiometry to find the moles of H_2 produced from 3 moles of NH_3. From the balanced equation, 2 moles of NH_3 produce 3 moles of H_2. Moles of H_2 = 3 mol NH_3 × 3 mol H_22 mol NH_3 = 4.5 mol H_2 Step 3: Calculate the volume of H_2 at STP. At Standard Temperature and Pressure (STP), 1 mole of any ideal gas occupies 22.4 L. Volume of H_2 = 4.5 mol × 22.4 L/mol = 100.8 L The closest option is D. The final answer is D. 101 L. --- Question 3: If you collected a sample of 3.50 moles of hydrogen gas, H_2, and heated it in a 10.00 liter container to a temperature of 300K, how much pressure would the H_2 exert on the container? Step 1