a mass of 2.33g of an unknown Monaromic gas is introduced into an evacuated 3.00

Question

a mass of 2.33g of an unknown Monaromic gas is introduced into an evacuated 3.00l flask at 257k

2) At a certaie t certain lemperatie asd preauus, dini tr en rTR"emde "nke,les hav.. of temperature and panr 3) Ammonis ges is producod commercially frotm the reaction of sitrogen and bydrogen. Whae volame of wmmonia can be peodaced from the reaction of 3. kg of Ny and 1.0k, of s a STP g A mass of 2.33g of sn unknown monatomic gas is introduced into an evacusted 3.00 dlask er 257k irhe resulting pressure is 312 mmHg, what is the idenity of the gas?

Explanation / Answer

use the PV = nRT fomula

where P = pressure 312 mmHg convert in to atm 0.41 atm

V = volume = 3.00 L

n = ?

R = 0.0821 Latm/mol-K

T = 257K

put all these values in the above equation

0.41 x 3.00 = n x 0.0821 x 257

n = 1.23 / 21.0997

n = 0.05829 moles

now use the formula no of moles = weight / molar mass

weight he has given is 2.33 g

molar mass = weight / no o fmoles

molar mass = 2.33 / 0.05829 = 39.97 g/mol

Gas is Argon (Ar) molar mass of Ar is 39.94 g/mol

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