Answer: 5.14 moles
Explanation:
heat supplied: 8280 J
The formula used for heat absorbed by an ideal gas:

where,
q = heat absorbed = 8280 J
= for monoatomic gas = 
n = number of moles
R = gas constant = 8.314 J/Kmol
= initial temperature = 206 K
= final temperature = 335 K
Now put all the given values in the above formula,


Thus there are 5.14 moles of gas in the container.
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Specific gravity is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. Apparent specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance.
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