Question

магнит массой 19,2 растворили 800 мл 12%раствора серной кислоты плотность 1,05гр/мл рассчитайте массовую долю сульфата магния в ионном растворе 2.определить химическую формулу вещества состав которого входят 5 массовых частей кальция и 3 массовых частиц углерода 46 сульфирования сделайте плизз дано и решение(в подробностях)оч надо

Answer 1

V= m/p => m= V*p ; m(раствора) 800 мл* 1,05 гр/мл= 840гр

w= m(вещ.) / m(раств.) *100% => m(вещ.) = m(раств.) * w / 100%

m(H2SO4) = 840 гр * 12%/ 100% = 100.8 гр.

количество вещества ( H2SO4)= 100.8 гр./ 98 г/моль=1.03 моль

количество вещества (Mg) = 19,2г/ 24 г/моль=0,8 моль

 

0.8 моль     1.03 моль       х моль

Мg        +   H2SO4 =         MgSO4  + H2

1 моль        1 моль           1 моль

 

Рассчитывания мы делаем с помощью кол.вещ. сульфата магня

х моль ( MgSO4)= 0.8 моль

m(MgSO4)= 0.8 моль * 120 г/моль =96 гр.

 

w= m(вещ.) / m(раств.) *100%

w (MgSO4)= 96 / 859.2 *100= 11.2%

 

 

Answer 2

Calculation of the Mass Fraction of Magnesium Sulfate in the Ionic Solution

To calculate the mass fraction of magnesium sulfate in the ionic solution, we need to determine the amount of magnesium sulfate present in the solution and the total mass of the solution.

Given: - Mass of the magnet: 19.2 g - Volume of the sulfuric acid solution: 800 mL - Concentration of the sulfuric acid solution: 12% - Density of the sulfuric acid solution: 1.05 g/mL

To find the mass of the sulfuric acid in the solution, we can use the formula:

Mass = Volume x Density

The mass of the sulfuric acid solution is calculated as follows:

Mass of the sulfuric acid solution = Volume of the solution x Density of the solution

Mass of the sulfuric acid solution = 800 mL x 1.05 g/mL

Now, we can calculate the mass of the sulfuric acid in the solution by multiplying the mass of the solution by the concentration of the sulfuric acid:

Mass of the sulfuric acid = Mass of the sulfuric acid solution x Concentration of the sulfuric acid

Mass of the sulfuric acid = (800 mL x 1.05 g/mL) x 0.12

Next, we need to calculate the mass of magnesium sulfate in the solution. The molar mass of magnesium sulfate (MgSO4) is 120.37 g/mol.

To find the mass of magnesium sulfate, we can use the formula:

Mass = Moles x Molar mass

The moles of magnesium sulfate can be calculated using the mass of sulfuric acid and the molar ratio between sulfuric acid and magnesium sulfate. The balanced chemical equation for the reaction between sulfuric acid and magnesium sulfate is:

H2SO4 + MgSO4 → Mg(HSO4)2

From the equation, we can see that 1 mole of sulfuric acid reacts with 1 mole of magnesium sulfate to form 1 mole of magnesium bisulfate.

Therefore, the moles of magnesium sulfate can be calculated as follows:

Moles of MgSO4 = Moles of H2SO4 x (1 mole MgSO4 / 1 mole H2SO4)

To find the moles of sulfuric acid, we can use the formula:

Moles = Mass / Molar mass

The molar mass of sulfuric acid (H2SO4) is 98.09 g/mol.

Now, let's calculate the moles of sulfuric acid:

Moles of H2SO4 = Mass of H2SO4 / Molar mass of H2SO4

Moles of H2SO4 = (Mass of the sulfuric acid solution x Concentration of the sulfuric acid) / Molar mass of H2SO4

Finally, we can calculate the mass of magnesium sulfate:

Mass of MgSO4 = Moles of MgSO4 x Molar mass of MgSO4

Now, let's calculate the mass fraction of magnesium sulfate in the ionic solution:

Mass fraction of MgSO4 = (Mass of MgSO4 / Mass of the solution) x 100%

Please note that the given information does not provide the concentration or molar mass of magnesium sulfate, which are required to calculate the mass fraction of magnesium sulfate in the solution. If you can provide these additional details, I can assist you further with the calculation.

Determining the Chemical Formula of a Substance

To determine the chemical formula of a substance based on the given information, we need to analyze the mass ratios of the elements present in the substance.

Given: - 5 parts by mass of calcium - 3 parts by mass of carbon - 46 parts by mass of sulfur

To determine the chemical formula, we need to find the simplest whole number ratio of the elements. We can assume that the total mass of the substance is 100 parts by mass.

From the given information, we can calculate the mass of each element as follows:

- Mass of calcium = (5/100) x Total mass - Mass of carbon = (3/100) x Total mass - Mass of sulfur = (46/100) x Total mass

Now, we need to find the molar mass of each element. The molar mass of calcium (Ca) is 40.08 g/mol, carbon (C) is 12.01 g/mol, and sulfur (S) is 32.07 g/mol.

Next, we can calculate the moles of each element using the formula:

Moles = Mass / Molar mass

- Moles of calcium = Mass of calcium / Molar mass of calcium - Moles of carbon = Mass of carbon / Molar mass of carbon - Moles of sulfur = Mass of sulfur / Molar mass of sulfur

Finally, we can determine the simplest whole number ratio of the elements by dividing the moles of each element by the smallest number of moles obtained.

The resulting ratio will give us the subscripts for the chemical formula of the substance.

Please note that the given information does not provide the total mass of the substance, which is required to calculate the mass of each element. If you can provide this additional detail, I can assist you further with determining the chemical formula.