If the density of a noble gas is 1.783 g/L at STP, that gas will be argon.
Density could be calculated using the formula d = M/V, where d will be density, M will be mass, and V will be volume. The density of a substance is usually measured in grams per cubic centimeter.
Gas can be found by using the formula:
Density = FW / 22.4
It is given that, density = 1.783 g/L
Put the value of density in above expression.
FW = density × 22.4.
FW = 1.783 g/L × 22.4.
FW = 39.93
FW ≅ 40
It is known that that argon has FW 40.Hence, gas will be argon.
If the density of a noble gas is 1.783 g/L at STP, that gas will be argon.
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