You have a gas cylinder containing an unknown gas. You remove some of the gas, p

Question

You have a gas cylinder containing an unknown gas. You remove some of the gas, putting it into a glass bulb. The mass of the cylinder decreases by 1.384 g. This bulb is attached to a manometer at SATP. If the volume of the gas in the manometer is 215 mL, and the height of the mercury is 0.938 m, what is the identity of the gas? A 250mL cylinder (P = 10.5 bar, T = 25 degree C) contains ammonia, NH_3, a base. If the entire content of the cylinder is dissolved in water, how much 0.110M HCl would be needed to neutralize the NH_3 solution? An unknown gas with the formula X_2 is kept in a 39.5 L storage tank at 5.0 degree C, 3962 mmHg. When the tank is emptied completely, the mass of the tank decreases by 637.7 g. What is the formula weight and identity of this gas?

Explanation / Answer

Ans 7

using the ideal gas law

PV = n RT

1.23421 × 0.215 = n × 0.08206 × 273

n = 0.012

Mass of 0.012 moles = 1.384 g

Molar mass = 1.384/ 0.012 = 116.9 g/mol

The closest element corresponding to this molar mass is tin

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