please someone help me... i dont know what formula to use?

Question

A 344 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 628 mmHg. Calculate the moles of Ar present.
_____ mol

i dont know what formula to use.....

Answer 1

Use the idea gas equation PV=nRT. You can solve for the total moles of gas.

Calculate the moles of Ne. Subtract from toal moles and you are done