Question

A reagent bottle of h2o2 labeled as 10v. The oxygen gas liberated from 2ml of this h2o2 is _______ ml

Answer 1

Answer:

1

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Answer 2

Answer:

1 volume of H

2

O

2

will give off 10 volumes of O

2

at STP.

The equation is: 2H

2

O

2

→2H

2

O+O

2

.

10 litres correspond to 0.409 moles of O

2

.

Therefore, the moles of H

2

O

2

are 0.818 = 27.812 g of H

2

O

2

.

The density of H

2

O

2

is 1.463 g/mL, so 27.78 grams is about 19.0 mL or 0.019 L.

Therefore, the percentage by volume is

1

0.019×100

=1.9 % by volume.

So, the nearest integer is 2%.