Question

In: Chemistry

a)How many mol are in 64.61 g of nickel(II) phosphite? b)How many mol of carbon are...

a)How many mol are in 64.61 g of nickel(II) phosphite?

b)How many mol of carbon are in 30.6 g of aluminum carbonate?

c)What is the mass (in grams) of 1.01 mol of iron(III) chloride?

d)What is the mass of oxygen in 5.71 g of aluminum oxide?

Solutions

Expert Solution

Solution

a)

mass of nickel(II) phosphite = 64.61 g

molar mass of nickel(II) phosphite = 148.361 g/mol

Number of mole = mass / molar mass = (64.61 g)/(148.361 g/mol) = 0.435 mole (ANS)

b)

Mass of aluminum carbonate, Al2(CO3)3 = 30.6 g

molar mass of aluminum carbonate =233.987 g/mol

No. of mole of aluminum carbonate = (30.6 g)/(233.987 g/mol) = 0.131 mole

In 1 mole of Al2(CO3)3 = 3 mole of carbon present

hence, no.of mole of carbon = 3 x 0.131 mole = 0.392 mole

c)

molar mass of Iron (III) chloride =162.2 g/mol

No. of mole of Iron (III) chloride, AlCl3 = 1.01 mole

mass of Iron(III) chloride, FeCl3 = (No. of mole of Iron(III) chloride) x (Molar mass of Ioron(III) chloride)

= (1.01 mole)x (162.2 g/mol) = 163.82 g (Ans)

d)

Mass of Aluminium oxide (Al2O3) = 5.71 g

Molar mass of Aluminium oxide (Al2O3) = 101.96 g/mol

No. of moles of Aluminium oxide (Al2O3) = (5.71 g)/(101.96 g/mol) = 0.0560 mole

In 1.0 mole of Al2O3, 3 mole of oxygen are present.

Therefore, No. of moles of oxygen in Al2O3 = 3 x 0.0560 mole = 0.1680 mole

Atomic mass of oxygen = 16 g/mol

the mass of oxygen = (No. of moles of oxygen )x (Molar mass of oxygen) =  0.1680 mole x 16 g/mol = 2.688 g (Ans)


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