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How many moles of helium

I am stuck on this now....As a birthday balloon is filled with helium, the amount of helium increases from 0.5 moles of helium
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2. asked by JD
3. 1,112 views
Adding helium to a balloon increased its volume from 360.9 mL to 3.532 L. If the final number of moles of helium in the balloon
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2. asked by wendy
3. 1,939 views
Three gases, xenon, helium, and hydrogen are confined in a 10.0 L vessel at a pressure of 7.0 atm. Intially the vessel contains
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2. asked by Paxton
3. 1,190 views
A mole of helium gas contains 6.02x10^23 helium atoms. How many helium atoms are there in a micromole of helium? How many moles
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2. asked by sara
3. 2,653 views
A helium balloon contains 0.54g of helium.Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it
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2. asked by Mira
3. 2,533 views
A helium ballon contains 0.32g of helium. Given the molecular weight of helium is 4. How many moles of helium does it contain.
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2. asked by Anonymous
3. 1,370 views
A helium balloon contains 0.30g of helium.Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it
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2. asked by bob
3. 1,017 views
A helium balloon contains 0.50 g of helium.Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it
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2. asked by Anonymous
3. 5,017 views
The equation of the reaction between 2 moles of proton and 2 moles of neutron producing Helium particles is a practical
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2. asked by Olushola
3. 525 views
the mole fraction of helium in a gas mixture is 0.16 if the total number of moles of gas in the mixture is 5.2 how many moles of
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2. 27 views