How many ace of club in a standard deck of cards?

Just one. In each standard deck of cards, there are four cards for each rank (excluding the jokers, which there are only two of).

For example, there are four aces. An ace of spades, an ace of clubs, an ace of hearts, and an ace of diamonds.

The reason there are four cards for each rank is because each rank has a card for each suit: diamonds, clubs, hearts, and spades.