[JamesAdams1]

Z is an organic compound and is found to contain carbon, hydrogen and oxygen only. combustion analysis of 0.500g of compound Z found it contained 0.133g carbon and 0.0111g hydrogen.
Molecular formula of z is C2H2O4.

0.0111g of hydrogen isolated from compound z was collected as water.

calculate the mass of water produced by 0.500g of Z during combustion analysis.

no idea please help.

[sjb]

0.0111g of hydrogen is how many moles? How many moles of water are made when that combusts? What is the mass of that amount of water?

[JamesAdams1]

0.00555 moles of hydrogen. 0.0111/2. Then multiply 18 to get 0.0999.