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Stoichiometry

Q1: Pick out the wrong statement.

A Ten times dilution of a normal solution (N) reduces its normality to N/10.

B When equal weights of oxygen and methane are mixed in an empty reactor at room temperature, then the fraction of total pressure exerted by the oxygen is 1/2.

C Volume occupied by 9.034 x 1023 atoms of oxygen in ozone (O3) at NTP will be 11200 c.c

D One kg mole of an ideal gas at N.T.P occupies 22400 Nm3.

ANS:D - One kg mole of an ideal gas at N.T.P occupies 22400 Nm3.

The wrong statement is: "When equal weights of oxygen and methane are mixed in an empty reactor at room temperature, then the fraction of total pressure exerted by the oxygen is 1/2." In reality, the fraction of the total pressure exerted by each gas in a mixture is determined by its mole fraction, not its weight fraction. Since oxygen and methane have different molar masses, equal weights of the two gases would not result in an equal number of moles of each gas. Therefore, the statement is incorrect. The correct statement would consider the mole fraction of each gas in the mixture to determine the fraction of the total pressure exerted by each component.



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