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In order to figure this out, you must do dimensional analysis. Here it is:

3.0 moles He x 4.0026 grams/ mole He = 12 grams

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Related Questions

How many moles of oxygen gas O2 are in 64 grams of O2?

The answer is 2 moles.


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To find the number of moles of hydrogen gas, we first need to convert the mass of hydrogen gas from grams to moles using the molar mass of hydrogen gas (2 g/mol). 5.04 grams of hydrogen gas is equal to 5.04 g / 2 g/mol = 2.52 moles of hydrogen gas.


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To find the weight of 2350 L of O2 gas at STP, you would first need to calculate the moles of gas using the ideal gas law. Then, use the molar mass of O2 to convert moles to grams. The molar mass of O2 is 32 g/mol, so you would multiply the moles by 32 g/mol to find the weight in grams.


Do you have to convert grams to moles for the ideal gas law?

No, you do not need to convert grams to moles when using the ideal gas law. The ideal gas law is typically used with moles of gas, but you can directly use grams by adjusting the units of the gas constant accordingly.


How many grams of water are made from complete reaction of 2.2 moles of oxygen gas with hydrogen gas?

The balanced chemical equation for the reaction between oxygen and hydrogen is2H2 + 02 -> 2H2OThus 2.2 moles of oxygen reacts with 4.4 moles of hydrogen to form 4.4 moles of steam (water in gaseous state).The mass of H2O obtained is thus 4.4 x 18.0 = 79.2g.


How many moles are in 64 grams of oxygen gas?

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How many moles of hydrigen are present in a 2 grams sample of hydrogen gas?

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What mass of oxygen gas contains the same number of moles as 56 gram of Sulphur?

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To find the number of moles in 5.67 grams of fluorine gas, you need to divide the mass by the molar mass of fluorine. The molar mass of fluorine is approximately 19 g/mol. Therefore, 5.67 grams of fluorine gas is equal to 5.67 g / 19 g/mol ≈ 0.298 mol.


How many moles are in 18.0grams of hydrogen gas?

To find the number of moles in 18.0 grams of hydrogen gas, you need to divide the given mass by the molar mass of hydrogen gas. The molar mass of hydrogen gas (H2) is about 2.016 grams/mol. So, 18.0 grams / 2.016 grams/mol ≈ 8.93 moles of hydrogen gas.