The mass of oxygen that can be obtained from 100 g of a 1.7% hydrogen peroxide solution

| May 7, 2021 | education

The mass of oxygen that can be obtained from 100 g of a 1.7% hydrogen peroxide solution is: a) 3.2 g; b) 6.4 g; c) 0.8 g; d) it is impossible to obtain oxygen from hydrogen peroxide.

In order to solve this problem, first compose the reaction equation and get the following reaction:
2H2O2 = 2H2O + O2
Next, we find the mass of hydrogen peroxide, for this we use the following formula:
W = m r.v. / m p – pa × 100%
from this formula we derive m r.v., Substitute the values ​​and solve:
m (H2O2) = 100 × 0.017 = 1.7 g
Next, we calculate the amount of substance using the following formula:
n = m / M
Next, we calculate the molar mass of hydrogen peroxide, and then the amount of substance
M (H2O2) = 1 × 2 + 16 × 2 = 34 g / mol
n (H2O2) = 1.7 / 34 = 0.05 mol
Next, we calculate the amount of oxygen
n (O2) = 0.025 × n (H2O2) = 0.05 /2=0.025 mol
calculate the molar mass of oxygen
M (O2) = 1 × 16 = 32 g / mol
m (O2) = n × M = 0.025 × 32 = 0.8 g
Answer: answer c, the mass of oxygen is 0.8 grams.



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