Answer : The amount of oxygen gas collected are, 0.217 mol
Explanation :
Using ideal gas equation :

where,
P = pressure of gas =
(1 atm = 760 torr)
V = volume of gas = 5 L
T = temperature of gas = 
n = number of moles of gas = ?
R = gas constant = 0.0821 L.atm/mol.K
Now put all the given values in the ideal gas equation, we get:


Thus, the amount of oxygen gas collected are, 0.217 mol
Answer:
<h3>The answer is 0.622 mL</h3>
Explanation:
The volume of a substance when given the density and mass can be found by using the formula

From the question
mass = 12 g
density = 19.30 g/mL
We have

We have the final answer as
<h3>0.622 mL</h3>
Hope this helps you
The isoelectric point<span> (</span>pI, pH(I),IEP<span>), is the pH at which a particular molecule carries no net electrical charge in the statistical mean.</span>
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Explanation:
you make use of the formulas
amount(mol) = number of particles ÷ 6.02 × 10^23
and
mass(g) = amount(mol) × molar mass