Question

Помогите пожалуйста очень срочно SOS... При взаимодействии 72 г магния с разбавленной серной кислотой выделилось 56 л водорода (н.у). Определите выход продукта (в %) от теоретически возможного. ЗАРАНЕЕ ОГPОМНОЕ СПАСИБО)

Answer 1

Сначала - реакция с коэффициентами. (Здесь их нет, и хорошо! Получается моль водорода на моль магния. Теоретически)
Mg + H2SO4 =MgSO4 + H2
Mr(Mg) =24г. У нас 72, и.е. 3 моля (н=м/М=72/24=3)
Значит и водорода (теоретически) должно быть 3 моля. ! моль газа при н.у. - это 22,4л, а объем 3 молей = 3·22,4= 67,2 л
А у нас 56л.
 Значит % выхода = (Vпракт./Vтеорет.)·100%=56/67,2=83,3% 

Answer 2

Calculation of the Product Yield in the Reaction between Magnesium and Sulfuric Acid

To determine the product yield in the reaction between 72 g of magnesium and diluted sulfuric acid, we need to calculate the theoretical amount of hydrogen gas that should be produced and compare it to the actual amount obtained.

The balanced chemical equation for the reaction between magnesium and sulfuric acid is as follows:

Mg + H2SO4 → MgSO4 + H2

According to the equation, 1 mole of magnesium reacts with 1 mole of sulfuric acid to produce 1 mole of magnesium sulfate and 1 mole of hydrogen gas.

To calculate the theoretical yield of hydrogen gas, we need to convert the mass of magnesium to moles using its molar mass and then use the stoichiometry of the balanced equation.

1. Calculate the moles of magnesium: - Molar mass of magnesium (Mg) = 24.31 g/mol - Moles of magnesium = mass of magnesium / molar mass of magnesium - Moles of magnesium = 72 g / 24.31 g/mol

2. Use the stoichiometry of the balanced equation to determine the moles of hydrogen gas produced: - According to the balanced equation, 1 mole of magnesium produces 1 mole of hydrogen gas. - Moles of hydrogen gas = moles of magnesium

3. Convert the moles of hydrogen gas to volume at standard temperature and pressure (STP): - 1 mole of any gas at STP occupies 22.4 liters. - Volume of hydrogen gas = moles of hydrogen gas * 22.4 L/mol

Now, let's calculate the theoretical yield of hydrogen gas:

Theoretical yield of hydrogen gas = Volume of hydrogen gas at STP

Please wait a moment while I perform the calculations.