10.
The charge of the ions in a compound is balanced.
A charge balanced compound can form when 2 Cr3+ combine with 3 SO42-.
Chemical formula: Cr2(SO4)3
11.
Mass of 1 mol of copper(II) sulfate pentahydrate = molar mass of copper(II) sulfate pentahydrate = 249.68 g
12.
Mass of C in the compound = 4.75 g
Molar mass of C = 12 g/mol
Moles of C in the compound = 4.75 g/12 g/mol = 0.396 mol
Mass of H in the compound = 0.80 g
Molar mass of H = 1 g/mol
Moles of H in the compound = 0.80 g/1 g/mol = 0.80 mol
Mole ratio of C : H = 0.396 : 0.80
= 0.5 : 1.0
= 1 : 2
Hence, the empirical formula of the compound = CH2
Let us say that the molecular formula of the compound = (CH2)n (where, n is an integer)
Molar mass of the compound from the empirical formula = n x (12 + 2) g/mol
= 14n g/mol
Now,
14n g/mol = 28 g/mol
or, 14n = 28
or, n = 2
Hence, the molecular formula of the compound = (CH2)2 = C2H4
help #10-12 QUESTION 10 Write the chemical formula for the compound formed from Cr3+ and SO42-...
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