In the reaction #CaC_2(s) + 2H_2O(l) -> C_2H_2(g) + Ca(OH)_2(aq)#, if 23 g of #CaC_2# are consumed in this reaction, how much #H_2O# is needed?
Moles of calcium carbide:
Given the equation,
You will need
We will make the following conversions to answer this question.
In order to do this, we need to determine the molar mass of each compound. We can calculate it or look it up on a reputable source. I like to use The PubChem Project.
We also need the mole ratio between the two compounds.
From the balanced equation we can see that the mole ratio between
We can put all of the steps together like this:
This way you can do the calculations all at once and round at the end, which reduces rounding errors.