Answer:
25.33 grams of water are produced.
Step-by-step explanation:
15 g H / 1.00784* = 14.8833 moles H
7.5 g O / 15.999** = 0.468779 moles O
Ratio of Hydrogen to Oxygen in Water: 2 : 1
Oxygen: 0.468779 moles
Hydrogen (calculated based on oxygen): 0.468779 * 2 = 0.937558 moles
Water: 0.468779 + 0.937558 = 1.406337 moles
Grams of water produced:
1.406337 mol * (water molar mass)
= 1.406337 mol * [2(1.00784) + 1(15.999)]
= 1.406337 mol * (18.01468***)
= 25.3347110272 g water
Notes:
*molar mass of hydrogen
**molar mass of oxygen
***molar mass of water is actually 18.01528, so the calculation of 18.01468 is close enough
-------------------------------- Summary --------------------------------
Convert hydrogen and oxygen to moles.
Determine number of moles of water using: 2 mole hydrogen + 1 mole oxygen = 1 mole water
Convert water moles to grams.