تكفون ساعدوني

[عبود7]

how many liters are needed of CO gas measured at STP to reduce 1 KG of fe2o3 as the equation ?
fe2o3+3o>2fe+3co2
...........................
for a mixture of N2(3moles) and O2(2moles) in 3L container at 298K what is the total pressure ?
.................
grams50 was collected above water at 25C*and 900mmHg and the vapor pressure was 40 mmHg what is the volume of O2 gas ?
........
if a dry hydrogen gas with 1.3atm was produced at 25C* what its volume ?
تكفون يا اخوان ساعدوني