How many heart cards are in a full deck of cards?

In a deck of cards there are the same number of cards for every suit. In a standard deck there are 52 cards and 4 suits. Dividing 52 cards by 4 means there are 13 of each suit, which includes hearts

there can only be 80 cards in a deck

A standard deck of 52 cards has 13 of each suit, including hearts.

There are 52 cards in a deck of cards.

13 of each suit; therefore 13.