As far as figuring out the math for chemistry, how do we know when we begin the

Question

As far as figuring out the math for chemistry, how do we know when we begin the equation what goes in the numerator and what goes in the denominator? I understand the concept of cross cancelling but I sometimes flip the what should go in the numerator when I begin any ideas? As far as figuring out the math for chemistry, how do we know when we begin the equation what goes in the numerator and what goes in the denominator? I understand the concept of cross cancelling but I sometimes flip the what should go in the numerator when I begin any ideas?

Explanation / Answer

While solving chemistry problems we must write simple steps .

For example, if we asked to find no.of grams of oxygen in 100 g water, then we must solve as follows

H2O molecular mass. - 18 g

So 18 g H2O contain 16 g O (oxygen)

Then 1 g H2O contains 16/18 g O

Therefore 100 g H2O contain - 100* 16/18 - 88.89 g O

There is no common rule to solve chemistry problems, we must do like this.

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