# How many moles of Helium are in 6 liters at STP?

22.4 liters will have 1 mole of Helium at STP.

So, 6 liters will have 0.23 moles

### How many moles of oxygen gas there in 135 L of oxygen at STP?

Since we know that one mole of any gas at STP is equal to 22.4 L we can multiply 135L by the following conversion: 1 mole/22.4L. When you set up the problem it looks like this: (135L)x 1 mole/22.4L =6.03 moles of oxygen gas The liters cancel out and you are left with moles as your units. Remember, if you have liters and want moles, divide by 22.4 liters; if you have moles and you…

### How many liters of CO2 at STP are produced from the complete combustion of 2.00 moles of heptane?

Heptane is C7H12. Hydrocarbons burn to form CO2 and water. If we balance the equation we get C7H12 + 10 O2 -> 7 CO2 + 6 H2O We see that for every mole of heptane burned we get 7 moles of CO2. Therefore 2 moles of heptane would get us 14 moles of CO2. 1 mole of any gas at standard temperature and pressure (STP) is equal to 22.4 liters. Multiply 22.4 liters by 14…