1. 2. Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with...

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1. Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq), as described

2.

Use the van der Waals equation of state to calculate the pressure of 4.00 mol of Co, at 475 K in a 5.30 L vessel. Use this li

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Answer 1

Answer #1

1)

Calculate the number of moles of Chlorine using the gas equation

PV =nRT

where n = no. of moles of chlorine

(785 torr)(0.155L) = n(62.36 L torr K^-1mole^-1)(273+25)K

n = (121.675)/(18583.28)

n = 0.006548 mole

The reaction is as

MnO2 (s) + 4 HCl(aq) →MnCl, (aq) + 2 H, 0(1) + Cl2 (8)

From the reaction, it is clear that 1 mole of MnO₂ produces 1 mole of chlorine.

Therefore, No. of moles of MnO₂ = moles of chlorine = 0.006548 mole

Mass of MnO₂ = (No. of moles of MnO₂)(Molar mass of MnO₂)

= (0.006548 mole)(118.93 g/mole)

= 0.7787 g

= 0.779 g (Ans)

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Answer 2

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