How many liters are present in 2.5 grams of nitrogen gas at STP? a
2.5g x 1mole/22.4L
b
2.5g x 1mole/14g x 22.4L/mol
c
2.5g x 1mole/28g x 22.4L/1mol
d
2.5g x 22.4L/1mole

PLEASE HELP

Explanation:

c

2.5g x 1mole/28g x 22.4L/1mol

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.