Question

Сколько граммов 8% раствора уксусной кислоты необходимо для получения водорода 2,8л при взаймодействие с его с магнием

Answer 1

M-?
w=0,08
V(H₂)=2,8 

2CH₃COOH + Mg = (CH₃COO)₂Mg + H₂

m(CH₃COOH)=mw

m(CH₃COOH)/{2M(CH₃COOH)}=V(H₂)/V₀

mw/{2M(CH₃COOH)}=V(H₂)/V₀

m=2M(CH₃COOH)V(H₂)/{wV₀}

m=2*60,05г/моль*2,8л/{0,08*22,4л/моль)=187,66 г

Answer 2

Calculating the Amount of Acetic Acid Solution Needed to Produce Hydrogen Gas

To calculate the amount of 8% acetic acid solution needed to produce hydrogen gas when reacting with magnesium, we can use the following chemical equation:

Mg + 2CH3COOH → Mg(CH3COO)2 + H2

From the balanced chemical equation, we can see that 1 mole of magnesium reacts with 2 moles of acetic acid to produce 1 mole of hydrogen gas.

Given that we need to produce 2.8 liters of hydrogen gas, we can use the molar volume of a gas at standard temperature and pressure (STP), which is 22.4 liters per mole.

Using the molar volume of a gas at STP, we can calculate the moles of hydrogen gas produced and then determine the amount of acetic acid solution needed.

Calculation

1. Calculate Moles of Hydrogen Gas Produced: - Moles of hydrogen gas = Volume of hydrogen gas / Molar volume at STP - Moles of hydrogen gas = 2.8 L / 22.4 L/mol - Moles of hydrogen gas = 0.125 moles

2. Determine Moles of Acetic Acid Needed: - From the balanced chemical equation, 1 mole of magnesium reacts with 2 moles of acetic acid to produce 1 mole of hydrogen gas. - Moles of acetic acid needed = 2 * moles of hydrogen gas - Moles of acetic acid needed = 2 * 0.125 moles - Moles of acetic acid needed = 0.25 moles

3. Calculate the Amount of 8% Acetic Acid Solution Needed: - The concentration of the acetic acid solution is 8%, which means there are 8 grams of acetic acid in 100 grams of the solution. - Mass of acetic acid in the solution = (8/100) * Total mass of solution - Mass of acetic acid in the solution = (8/100) * Total mass of solution - Total mass of solution = Moles of acetic acid needed / Concentration of acetic acid solution - Total mass of solution = 0.25 moles / 0.08 - Total mass of solution = 3.125 moles

Answer

To produce 2.8 liters of hydrogen gas when reacting with magnesium, approximately 3.125 moles of 8% acetic acid solution are needed.