Determine the volume, in liters, occupied by 0.015 molecules of oxygen at STp?
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Ответ:
5.58 X
Litres is the volume, in liters, occupied by 0.015 molecules of oxygen at STP.
Explanation:
Data given:
molecules of oxygen = 0.015
number of moles of oxygen =?
temperature at STP = 273 K
Pressure at STP = 1 atm
volume = ?
R (gas constant) = 0.08201 L atm/mole K
to convert molecules to moles,
number of moles =![\frac{molecules}{Avagadro's number}](/tpl/images/0612/7406/22793.png)
number of moles = 2.49 x![10^{-26}](/tpl/images/0612/7406/e94f5.png)
Applying the ideal gas law since the oxygen is at STP,
PV = nRT
rearranging the equation:
V =![\frac{nRT}{P}](/tpl/images/0612/7406/42830.png)
putting the values in the rearranged equation:
V =![\frac{2.49 X10^{-26} X 0.08201 X 273}{1}](/tpl/images/0612/7406/03da5.png)
V = 5.58 X
Litres.
Ответ:
1) Acidic - gastric juices pH 1, lemon juice pH 2.2, tomato juice pH 4.
2) Neutral - salt solution pH 7.
3) Alkaline - baking soda pH 9, bleach pH 13.
pH is a numeric scale used to specify the acidity or basicity of an aqueous solution.
When pH is less than seven (pH<7), solution is acidic.
When is equal seven (pH = 7), solution is neutral.
When pH is greater than seven (pH > 7), solution is basic.