2 atoms of hydrogen to 1 atom of oxygen.
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If you are writing a ratio for the compound water (H2O) That means there are 2 Hydrogen (H) And one oxygen (O) That means the ratio is 2:1
you set up a proportion and cross multiply then divide
A proportion is an equation in which 2 fractions are set equal. A rate is the ratio of change of two things. Speed is a rate, the ratio of distance to time.
You need to figure out the density of the substance you want to convert. If it is water, i.e. H2O, the conversion is a 1:1 ratio, as water has a density of 1g/ml.
Reduce it if possible. Then set it equal to the similarity ratio of a-cubed over b-cubed, take the cubed route and theres your answer.