Question

how many moles are present in 40dm^3 of O2 gas at STP​

Answer 1

Answer:

1.78moles

Explanation:

at STP

22.4dm³ gas contain 1 mole

=> 1dm³ gas contain = 1/22.4

=> 40dm³ gas contain => 40/22.4 moles

=> 1.78 moles

u can also use , formula PV=nRT,

put all value and u will get answer...