If one mole each of ch4, nh3, h2s, and co2 is added to 1 liter of water in a flask (1 liter of water = 55.5 moles of h2o), how many moles of hydrogen, carbon, oxygen, nitrogen, and sulfur are in the flask? round your answers to the nearest whole number.

how many moles of hydrogen, carbon, oxygen, nitrogen, and sulfur will there be?

1 litre of water is = 55.5 moles of water.
water is H2O
so, in water:
moles of oxygen = 55.5
moles of hydrogen = 2 x 55.5 = 111

Now, 1 mole each of CH4, NH3, H2S, and CO2 are added:
For CH4: 
moles of C = 1
moles of H = 4 x 1 = 4

For NH3:
moles of N = 1
moles of H = 3 x 1 = 3

For H2S:
moles of H = 2 x 1 = 2
moles of S = 1

For CO2:
moles of C = 1
moles of  = 2 x 1 = 2

Now, add the total moles of each atom:
Hydrogen = 111 + 4 + 3 +1 = 119 moles
Oxygen = 55.5 + 2 = 57.5
Carbon = 1+1 = 2
Sulfur = 1
nitrogen = 1