Question

вычислите объём и количество вещества водорода, который может быть получен при взаимодействии 400 г 49%-ной серной кислоты с магнием,НУЖНО ДО ЗАВТРА!!!ПОМОГИТЕ ПЖЛ-СТА!

Answer 1

H2SO4+Mg=MgSO4+H2

n(H2SO4)=$\frac{400*0,49}{98}=2$моль

n(H2SO4)=n(H2)=2 моль

m(H2)=2 моль*2=4 г.

Answer 2

Calculation of Hydrogen Volume and Amount of Substance

To calculate the volume and amount of substance of hydrogen that can be obtained from the reaction between 400 g of 49% sulfuric acid and magnesium, we need to use the balanced chemical equation for the reaction and apply stoichiometry.

The balanced chemical equation for the reaction between sulfuric acid (H2SO4) and magnesium (Mg) is as follows:

H2SO4 + Mg → MgSO4 + H2

From the balanced equation, we can see that one mole of sulfuric acid reacts with one mole of magnesium to produce one mole of hydrogen gas.

To calculate the amount of substance of sulfuric acid, we need to convert the given mass of sulfuric acid to moles using its molar mass. The molar mass of sulfuric acid (H2SO4) is approximately 98.09 g/mol.

Amount of substance of sulfuric acid = (mass of sulfuric acid) / (molar mass of sulfuric acid)

Amount of substance of sulfuric acid = 400 g / 98.09 g/mol

Now, we can calculate the amount of substance of hydrogen gas produced using stoichiometry. Since the stoichiometric ratio between sulfuric acid and hydrogen gas is 1:1, the amount of substance of hydrogen gas will be the same as the amount of substance of sulfuric acid.

Amount of substance of hydrogen gas = Amount of substance of sulfuric acid

Finally, to calculate the volume of hydrogen gas, we can use the ideal gas law, which states that the volume of a gas is directly proportional to its amount of substance.

Volume of hydrogen gas = Amount of substance of hydrogen gas * molar volume of gas at standard temperature and pressure (STP)

The molar volume of gas at STP is approximately 22.4 L/mol.

Now, let's calculate the volume and amount of substance of hydrogen gas.

Amount of substance of sulfuric acid = 400 g / 98.09 g/molAmount of substance of hydrogen gas = Amount of substance of sulfuric acid Volume of hydrogen gas = Amount of substance of hydrogen gas * 22.4 L/mol

Please note that the exact calculation requires the concentration of the sulfuric acid to be specified. The given information of "49% sulfuric acid" is not sufficient to determine the exact concentration.