True or False? In a C++ floating-point constant, a decimal point is not required if exponential (E) notation is used.
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The full question can be seen below:
The decomposition of is represented by the equation above.
A student monitored the decomposition of a 1.0 L sample of at a constant temperature of 300K and recorded the concentration of
as function of time. The results are given in the table below:
Time (s)
0 2.7
200 2.1
400 1.7
600 1.4
The produced from the decomposition of the 1.0 L sample of
is collected in a previously evacuated 10.0 L flask at 300 K. What is the approximate pressure in the flask after 400 s?
(For estimation purpose, assume that 1.0 mole of gas in 1.0 L exerts a pressure of 24 atm at 300 K).
Answer:
1.2 atm
Explanation:
Considering all assumptions as stated above;
Initial 2.7 mole --- ---
Change -1.0 ---
Equilibrium 1.7 mole --- 0.5 mole
To determine the concentration of O₂; we need to convert the moles to concentration for O₂ =
=
= 0.05
Thus, based on the assumption that "1.0 mole of gas in 1.0 L exerts a pressure of 24 atm"
∴ 0.05 will give rise to = 0.05
× 24
= 1.2 atm