The correct form to use the question words how much and how many is: how much is used when is a singular thing and how many when it is a plural thing.
These forms of questions have the next translations into Spanish:
The how much is used to mention nouns that are usually mentioned in the singular, such as liquids or those that require mentioning their measure first, such as rice or sugar.
For its part, how many is used to mention those nouns that can be easily counted with cardinal numbers, so its applicability is usually focused on plurals.
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