Task 20633.

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The cylinder volume V = 0.25 m ^ 3 is a mixture of oxygen and helium. The number of oxygen molecules N1 = 6,6 * 10 ^ 21, and the number of helium molecules N2 = 0,9 * 10 ^ 21. The temperature of the mixture T = 620 K. Determine the pressure of the mixture R.

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