Question
Problem 1: 2As+6NaOHarrow 2Na_(3)AsO_(3)+3H_(2) Given: 15 grams of As and 1 point 25L NaOH Find: the grams of H_(2) that can be produced? 0.60gH_(2) 1.12gH_(2) 45gH_(2) 25gH_(2) 10gH_(2)
Solution
4.4
(190 Votos)
Yasmin
Profissional · Tutor por 6 anos
Resposta
To solve this problem, we need to determine the limiting reactant and then calculate the amount of hydrogen gas (H2) produced.Given information:- 15 grams of arsenic (As)- 25 liters of sodium hydroxide (NaOH)Step 1: Calculate the moles of As and NaOH.Moles of As = 15 g / (74.92 g/mol) = 0.200 molMoles of NaOH = 25 L × (4.00 mol/L) = 100 molStep 2: Determine the limiting reactant.The balanced chemical equation is:2As + 6NaOH → 2Na3AsO3 + 3H2From the balanced equation, we can see that 2 moles of As react with 6 moles of NaOH to produce 3 moles of H2.Moles of H2 produced from As:0.200 mol As × (3 mol H2 / 2 mol As) = 0.300 mol H2Moles of H2 produced from NaOH:100 mol NaOH × (3 mol H2 / 6 mol NaOH) = 50 mol H2Since the moles of H2 produced from As (0.300 mol) is less than the moles of H2 produced from NaOH (50 mol), As is the limiting reactant.Step 3: Calculate the grams of H2 produced.Moles of H2 produced = 0.300 molGrams of H2 produced = 0.300 mol × (2.016 g/mol) = 0.6048 gTherefore, the grams of H2 that can be produced is 0.60 g.The correct answer is: