PLEASE HELP WILL GIVE 20PTS AND WILL MARK BRAINLIEST FOR RIGHT ANSWER!!! Water can be formed from the synthesis reaction of hydrogen with oxygen:

2 H2 (g) + O2 (g) → 2 H2O (g)

The complete reaction of 5.12 Liters of O2 with excess hydrogen produces how many moles of H2O?

A) 10.24 moles H2O
B) 114.7 moles H2O
C) 0.457 moles H2O
D) 5.12 moles H2O

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)]