vs 

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"That much" is an adverb which is often translated as "tanto", and "so many" is a phrase which is often translated as "tantos". Learn more about the difference between "that much" and "so many" below.
that much(
thaht
 
muhch
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. tanto
If I had known that you like spaghetti that much, I would have made you more.Si hubiera sabido que te gusta el espagueti tanto, te hubiera hecho más.
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so many(
so
 
meh
-
ni
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. tantos
Look at all these flavors! There are so many it's hard for me to just pick one.¡Mira todos estos sabores! Hay tantos que no puedo escoger solo uno.
a. tanto
There are so many things I have to tell you.Tengo tantas cosas que contarte.
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