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miss Akunina [59]
2 years ago
12

a mixture is known to contain mercury (ii) oxide. a 4.85 gram sample of the mixture is heated, decomposing the mercury (ii) oxid

e, and 2.54 L of oxygen gas are collected at 305.2 K and .967 atm. what is the percentage of mercury (ii) oxide in the mixture
Chemistry
1 answer:
Olegator [25]2 years ago
7 0

Number of moles in mercury oxide = 0.00981 moles O_{2}

Number of oxide required in decomposition of mercury = 4.249 g H_{g} O

Percentage of mercury required = 87.6%

Evaluating the value :

First determine the number of moles of O_{2} obtained using the ideal gas law.

To use the gas constant 0.0821 L-atm/mole-degree, the pressure and volume must be changed to atmospheres and liters and the temperature changed to degrees K.

To find the number of moles use

n  = \frac{PV}{RT}

=  735/760 x 0.254 / 0.082 x 305.15

=  0.00981 moles.O_{2}

The balanced equation is 2H_{g} O====>  2Hg  +  O_{2}

so a conversion factor to get grams H_{g} O from moles O_{2} is

  2 x 216.59 g HgO /  1 mole O_{2}  =  433.18.

The grams of HgO then is 433.18 x 0.00981

=  4.249 g HgO required to produce 0.00981 moles of O2 by decomposition.

The percent of HgO in the mixture is then

= 4.249 / 4.85 x 100

=  87.6%.

Mixture of mercury :

The element mercury is a pure substance. Nickel sulfate is also a pure substance but it is a compound of the elements nickel, sulfur, and oxygen.

Mercury is a compound that can be found naturally in the environment. It can be found in metal form, as mercury salts or as organic mercury compounds.

Learn more about mercury compound :

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Kp= Kc (RT)^Δn------------------> Kc= Kp/[(RT)^Δn]
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25. 00 ml of a buffer solution contains 0. 500 m hclo and 0. 380 m naclo. if 50. 00 ml of water is added to the buffer, what are
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