Much is used with uncountable words Many is used with countable words

how many is when there are an unknown number of things. how many is used when counting things - the answer is likely more than 1. how much means the the count of one certain thing: "how much money". this is because money is one thing, and you want to see the quantity of that one thing. BAD: How much things is in your bag? GOOD: How many things are there in your bag? ("things" is plural - something of a number more than 1) BAD: How many stuff are there in your bag? GOOD: How much stuff is in your bag? (stuff is singular - there may be a lot of stuff, in the bag - but 'stuff' is singular). we never say how many monies, we always say how much money - because money is one kind of thing and we want to know the amount. here is a page in spanish and english which I hope you find useful: http://www.clafoti.com/imagenes10/how_much_many.htm

la diferencia es que "mucho" se refiere a uno (singular) y "muchos" a varios (plural) the difference is that "mucho" is about one (singular) and "muchos" means many (plural). In spanish, you make plural with an "s" at the end of the word.