This is a very easy question. I am sure it is at the books.
STP is standard temperature and pressure to test gases at an uniform condition to describe gas behavior.
All the units for any problems need to be converted to moles, Kelvin, and atmospheres for pressure. Even if one is working on a bicycle tire inflation problem using psi, pounds per square inch, that has to be converted to atmospheres. Celisus to Kelvin is done by adding 273.15 to get Kelvin.
There are no one formula to solve conversion problems, there is a method of dimensional analysis to solve it by step wise cancellation of units by multiplication and diversion.
One mole is Avogadro's number of anything, 6.022 * 10^23 of anything, atoms or molecules or anything, quantity. The atomic mass on the pweriod table is the mass of one mole of that element. One mole is 6.022*10^23 atoms of that element. Here is an example: One mole of carbon atoms have a mass of around 12 grams. One mole of oxygen atoms has 16 grams mass. Oxygen atoms are diatomic, but the mole ignores how the atoms are arranged or joined, just the numbers of atoms.
I hope this helps. Have a Happy New Year.
Lawsen Lew
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