When magnesium silicide is acted upon by hydrochloric acid, a silane is formed. Write down the equation

| May 19, 2021 | education

When magnesium silicide is acted upon by hydrochloric acid, a silane is formed. Write down the equation for the reaction of obtaining and igniting silane and calculate how much air will be required to burn 12 liters of silane.

Mg2Si + 2HCl = MgCl2 + SiH4.

SiH4 + 2O2 = SiO2 + 2H2O.

Let’s find the amount of substance SiH4.

n = V: Vn.

n = 12 L: 22.4 L / mol = 0.536 mol.

There are 2 mol of O2 per mole. Substances are in quantitative ratios 1: 2. The amount of substance O2 is 2 times greater than SiH4.

n (О2) = 2n (SiH4) = 0.536 × 2 = 1.072 mol.

Find the volume of O2.

V = n Vn, where Vn is the molar volume of the gas equal to 22.4 l / mol.

V = 1.072 mol × 22.4 L / mol = 24.01 L.

24.01 – 21%,

X- 100%,

X = (24.01 × 100%): 21% = 114.33 liters.

Answer: 114.33 liters.



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