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4 g of Helium = 1 mole.So, 56 g of helium = 14 moles

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10y ago
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11y ago

If you are talking about dinitrogen (N2), then this is the answers.

? mol= 42 g * 1 mol/28.02 g = 1.50 moles

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8y ago

The answer is 2,5 moles.

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Q: What is the number of moles of gas in 56.0 L of oxygen at STP?
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How many moles of oxygen gas are there in 180 L of oxygen at STP?

If the density of oxygen atSTP is 1,429 g/L the mass of 180 L is 257,22 g.If the mole of oxygen (O2) is 15,999 g the number of moles is 16,077.

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If a large balloon contains 224 liters of gas at STP then there is 100 mole of gas in the balloon How many moles of gas are in a balloon that is 560 liters at STP?

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What is the number of moles of gas in 30 L of oxygen at STP?

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How many moles of o2 molecules are there in 50dm3 of o2 gas at STP?

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How many moles of methane are presentin 5.6L of the gas at stp?

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How many liters of oxygen are needed to exactly react with 27.8 g of methane at STP?

1) First find the number of moles of methane in 27.8 g using the molar mass.See the Related Question to the left of this answer "How do you convert from grams to moles and also from moles to grams?" to do that.2) Then write the balanced reaction. Methane (CH4) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O). See the related question "How do you balance a chemical reaction?" to do that.3) That will tell you the ratio of moles of methane to moles of oxygen (it will be 2 to 1). So from Part 1, multiply the number of moles of methane by 2 to get moles of oxygen. Then, use the Ideal Gas Law to find out how many liters that will take up at STP. Use the Related Question link "How do you solve Ideal Gas Law problems?" to do that.