How many grams of water are produced by reacting 15.8 g H2 with excess oxygen?

Question

vera_ewing · Answer

@Abhisar please help quick!

abhisar · Answer

Firt write  down the balanced equation

vera_ewing · Answer

2H2 + O2 ---> 2H2O

anonymous · Answer

Then use either molar or mass ratios of hydrogen to oxygen. Better use of mass, because it will facilitate you to find the mass directly.

anonymous · Answer

I mean ratio of hydrogen to water.

vera_ewing · Answer

@Hoslos i got 15.8...is that right?

abhisar · Answer

frm the equation u cn see that 4 grams of H2 produces 32 grams of water. Find how many grams of water will be produced by 1 gram of H2

abhisar · Answer

then multiply it with 15.8

vera_ewing · Answer

ohhh so 282 g is the answer. thank you :)

abhisar · Answer

It's 36 grams and not 32 grams...

anonymous · Answer

No. Find the molar ratio first of H to H2O. It is 1:1 simplified, therefore with the mass ratios are 2:18 or 1:9, therefore with 15.8g of H, you have  15.8*9/1=142.2g of water.

vera_ewing · Answer

@Hoslos thanks for the correction. i really appreciate your help. :)

abhisar · Answer

4 gram $\sf H_2$ -----> 36 gram $\sf H_2O$

=> 1 gram of $\sf H_2$ ------> 36/4=9 grams $\sf H_2O$

anonymous · Answer

No problem.

abhisar · Answer

Now 15.8 grams of $\sf H_2$ will produce $\sf 9\times 15.8$ grams of water...