Which of the following equations is balanced?

2h2 + o2 → 4h2o
4na + o2 → 2na2o
fe2o3 + h2 → 2fe + 3h2o
ch4 + o2 → co2 + h2o

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

According to le chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress. normalizes the stress. increases the stress. changes the stress.

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]