Question

Рассчитать % состав химического элемента Mg в соединении MgSO4. Строго по матрице

Answer 1

Массовая доля  элемента в данном веществе (w) – отношение относительной атомной массы данного элемента, умноженной на число его атомов в молекуле к относительной молекулярной массе вещества.

w(элемента) = (n· Ar(элемента) · 100%) / Mr(вещества)

w(Mg) = (n· Ar(Mg) · 100%) / Mr(MgSO4)

w (Mg) = (1*24 *100%) / 120 = 20% или 0,2

Answer 2

Calculating the Percentage Composition of Mg in MgSO4

To calculate the percentage composition of Mg in MgSO4, we need to determine the molar mass of MgSO4 and the molar mass of Mg. Then, we can use the formula:

Percentage composition of Mg = (Molar mass of Mg / Molar mass of MgSO4) * 100

Let's calculate it step by step:

1. Determine the molar mass of MgSO4: - The molar mass of Mg is approximately 24.31 g/mol. - The molar mass of S is approximately 32.07 g/mol. - The molar mass of O is approximately 16.00 g/mol. - Since there are four oxygen atoms in MgSO4, we multiply the molar mass of O by 4. - Therefore, the molar mass of MgSO4 is: Molar mass of MgSO4 = (Molar mass of Mg) + (Molar mass of S) + (4 * Molar mass of O) = 24.31 g/mol + 32.07 g/mol + (4 * 16.00 g/mol) = 24.31 g/mol + 32.07 g/mol + 64.00 g/mol = 120.38 g/mol

2. Calculate the percentage composition of Mg: - Using the formula mentioned earlier: Percentage composition of Mg = (Molar mass of Mg / Molar mass of MgSO4) * 100 = (24.31 g/mol / 120.38 g/mol) * 100 ≈ 20.2%

Therefore, the percentage composition of Mg in MgSO4 is approximately 20.2%.

Please note that the values used for molar masses are approximate and may vary slightly depending on the source.