What is the molar mass of a gas if it has a density of 2.40g/L at 851.2mmHg and 2°C

The molar mass of gas is 48.4 g/mol

Explanation:

To calculate the relation of density and molar mass of a compound, we use the ideal gas equation:

P = pressure  = 851.2 mm Hg = 1.12 atm     ( 760 mm Hg = 1atm)

V = Volume  

n = number of moles

R = gas constant  = 0.0821 Latm/Kmol  

T = temperature  =

Number of moles (n) can be written as:

where, m = given mass

M = molar mass

where,

where d = density

The relation becomes:

Putting the values we get :

Thus molar mass of gas is 48.4 g/mol

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72