Q&A for How to Calculate Partial Pressure

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How do I calculate the pressure before the solution was made?

Bess Ruff, MA
Environmental Scientist
Bess Ruff is a Geography PhD student at Florida State University. She received her MA in Environmental Science and Management from the University of California, Santa Barbara in 2016. She has conducted survey work for marine spatial planning projects in the Caribbean and provided research support as a graduate fellow for the Sustainable Fisheries Group.

Bess Ruff, MA

Environmental Scientist

Expert Answer

If you know the volume of a gas and the relationship the volume of that gas has with pressure then you can calculate initial pressure (i.e. the pressure before the solution was made) using the equation for Boyle's Law included in the article.

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What is a partial pressure of oxygen in a container that contains 2.0 mol of oxygen, 3.0 mol of nitrogen, and 1.0 mol of carbon dioxide when the total pressure is 900 Torr?

Community Answer

Use the law of partial pressures (P_total = P_O + P_N + P_CO2) along with the ideal gas law, PV = nRT.

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How many molecules are there in a 3.46 gram sample of hydrogen chloride?

Community Answer

Hydrogen chloride is composed of one atom of hydrogen and one atom of chlorine. You can find the molar mass of HCl by adding the molar masses of hydrogen and chlorine, this will give you how many moles of HCl there are per gram. Use this to convert from grams to moles.

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What is the partial pressure of each gas with a mixture of 2 moles of H2, 4 moles of NO2, and 6 moles of CO2 that has a total pressure of 1200 Torr?

Community Answer

Use the law of partial pressures (P_total = P_H2 + P_NO2 + P_CO2) with the ideal gas law (PV = nRT).

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A gas cylinder of half argon and half helium has a total pressure of 1.11. What is the partial pressure of each gas?

Community Answer

Use the law of partial pressures (P_total = P_Ar + P_He) with the ideal gas law (PV = nRT).

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A container with two gases helium and argon is 30.0% by volume. What is the partial pressure inside the container at 4.00 atm?

Community Answer

Use the law of partial pressures (P_total = P_He + P_Ar) with the ideal gas law (PV = nRT).

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How do I find partial pressure?

Community Answer

Use the equation partial pressure= P1+P2+P3, and the number of this is the answer to your question.

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