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If concentrations are not explicitly given, there will usually be a way to calculate them. You might be given moles (or mass, which can be converted to moles) and a volume. You can find concentration by dividing moles by volume. If you are given gases and their partial pressures are known and the temperature is given, you can use the ideal gas law to calculate n/V which is molarity.
Do you have an example of a problem where this is the case?
Every problem should have some method of being able to retrieve the other concentrations. If you aren't explicitly given a concentration, you might be able to use partial pressures in conjunction with moles withe the ideal gas equation. It's honestly just a matter of how much you play with the variables to manipulate them into something that you want.
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