Answer:
About 21.2 moles.
Step-by-step explanation:
Recall the ideal gas law:
Where P is the pressure of the gas; V is its volume; n is the number of moles of gas; R is the universal gas constant; and T is the absolute temperature.
Rearrange to solve for n:
Because R has units of L-atm/mol-K, convert the pressure to atm:
And convert from Celsius to kelvins:
Hence substitute and evaluate:
In conclusion, there are about 21.2 moles of acetylene in the tank.