If we wish to burn 3.5 moles of propane, how many moles of oxygen gas is needed?

17.5 moles of oxygen gas

Explanation:

Propane burns with the help of oxygen according to the following reaction

It can be seen that for 1 mole of propane 5 moles of oxygen is required.

The reaction will be

Therefore 17.5 moles of oxygen gas will be needed to burn 3.5 moles of propane.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.