How many moles of ammonia are present in...

How many moles of ammonia are present in `5.6 cm^3` of ammonia gas at STP?

A

`2.0 xx 10^(-4) mol`

B

`2.5 xx 10^(-4) mol`

C

`3.9 xx 10^(-3)mol`

D

`4.5 xx 10^(-4) mol`

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