PLZ HELP ASAP. VERY MUCH NEEDED...

Explanation:

We can use the Ideal Gas Law to calculate the density of the gas.

 pV = nRT

    n = m/M            Substitute for n

  pV = (m/M)RT     Multiply both sides by M

pVM = mRT           Divide both sides by V

  pM = (m/V) RT

     ρ = m/V            Substitute for m/V

  pM = ρRT            Divide each side by RT

Data:

The gas is N₂ at STP (0 °C and 1 bar)

p = 1 bar

M = 28.01 g/mol

R = 0.083 14 bar·L·K⁻¹mol⁻¹

T = 0 °C = 273.15 K

ρ = (1 × 28.01)/(0.083 14 × 273.15) = 1.23 g/L

It appears that you are using the old definition of STP. Standard pressure has been defined as 1 bar since 1982.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

i believe the answer is 5,000