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lesya [120]
4 years ago
15

A 25.00 mL flask contains methane (CH4) gas at 22.5°C. The pressure in the flask is 225.2 mmHg. How many moles of methane are in

the flask?
Chemistry
1 answer:
Arturiano [62]4 years ago
7 0
<h3><u>Answer;</u></h3>

= 0.232 moles

<h3><u>Explanation;</u></h3>

Using the ideal gas Law ;

n = PV/RT ; Where, R is the ideal gas constant (0.0821 L atm / K mole), n is the number of moles, P is the pressure, V is the volume and T is the temperature.

V = 0.025 L, T = 22.5 +273 = 295.5 K, P = 225.2 mmHg

n = (225.2 × 0.025)/(295.5 × 0.0821 )

  <u>= 0.232 moles</u>

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The mass of water in a single popcorn kernel was found to be 0.905 grams after it popped at a temperature of 175 °C. Using the i
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0.583 kilojoules

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The Michaelis constant for pancreatic lipase is 5 mM. At 60 C, lipase is subject to deactivation with a half-life of 8 min. Fat
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Explanation:

According to the given data, we will calculate the following.

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                                       = 480 s

Rate constant for first order reaction is as follows.

         k_{d} = \frac{0.6932}{480}

                        = 1.44 \times 10^{-3}s^{-1}&#10;

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                                                = 45 mmol/L

Rate of hydrolysis V_m_{o} = 0.07 mmol/L/s

Conversion X = 0.80

Final concentration (S) = S_{o} (1 - X)

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                                      = 9 mol/m^{3}

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Now, putting the given values into the above formula as follows.

            t = -\frac{1}{K_{d}}ln[1 - \frac{K_{d}}{V}{K_{M} ln (\frac{S_{o}}{S}) + (S_{o} - S)]  

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              = 1642.83 s \times \frac{1 min}{60 sec}

              = 27.38 min

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