Question

2 oxygen reacts with 16 oxygen and produce 18 water. Which law related to this

Answer 1

The answer that Mathew provided is correct, but I would like to show some other steps that could be used to solve future problems. So, the equation for this problem is

2H+O ------> H2O

however what if we didn't know this? Well, first we would need to calculate the empirical formula (lowest mole ratio of atoms) this can be done by simply finding the ratio of moles given. We know that H and O react to create water (unknown formula), and we know that H has a +1 charge while O has a -2 charge. So if they were to create a netrual molecule it would  need 2H for ever 1O.

So we have a ratio to work with, now we can convert grams to moles and we get

grams of sample/molar mass of element(g/mole)= moles of element

4.8g H/ 1g/mole H= 4.8 moles of H

(2 H are needed  for proper ratio so, 4.8/2=2.4mol per H)

38.4g O/ 16g/mole= 2.4 moles of O

Now, the ratio of H to O is 2-1, just like the ratio. Now since the moles given are even in ratio, and we know the moles of one of the reactants we can calculate moles of product. Which will equal 2.4 moles H2O.

Answer 2

ANSWER:

The law related to this is ------Henry's Law