Solid aluminum reacts with aqueous h2so4 to form h2 gas and aluminum sulfate. when a sample of al is allowed to react, 415ml of gas is collected over water at 23°c at a pressure of 755mmhg. at 23°c the vapor pressure of water is 21mmhg. what is the pressure in mmhg of the dry h2 gas?

The pressure of dry hydrogen gas is 734 mm Hg.And number of moles of hydrogen gas is 0.017mol.

Reacted mass of aluminium is 0.306 g.

Explanation:

The total pressure is the sum of the individual pressure.

Total pressure = 755 mmHg

Pressure of water = 21mmHg

Therefore, The pressure of dry hydrogen gas is 734 mm Hg.

Number of moles of hydrogen gas can be calculate is as follows.

From the given,

Pressure "P" = 755 mmHg = 0.993 atm

Volume"V"= 415 mL = 0.415 L

Gas constant "R" = 0.0821 L.atm/mol.K

Temperature = 23+273= 296 K

Therefore, number of moles of hydrogen gas is 0.017mol.

Mass of aluminium reacted:

Therefore, Reacted mass of aluminium is 0.306 g.

your answer would be “dry”

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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