23.22%:
2.5 L in mL : 2.5 * 1000 = 2500 mL
23.22 g ----------- 100 mL
? g ------------- 2500 mL
m = 2500 * 23.22 / 100
m = 58050 / 100
m = 580,5 g
Answer:
Lead atoms have 82 electrons and the shell structure is 2.8. 18.32. 18.4.
Explanation:
The ground state electron configuration of ground state gaseous neutral lead is [Xe].
The pH of the solution is obtained to be 9.67.
<h3>What is a buffer?</h3>
A buffer is a solution that serves to militate against changes in acidity or alkalinity. The buffer is often made of a solution of a strong acid and its salt or a weak base and its salt.
Now we have the that;
Number of moles of base = 250 /1000 * 0.80 = 0.2 moles
Number of moles of salt = 150/1000 * 0.50 = 0.075 moles
Total volume of the solution = 250 + 150 = 400 mL or 0.4 L
Molarity of the base = 0.2 moles/0.4 L = 0.5 M
Molarity of the salt = 0.075 moles/ 0.4 L = 0.1875 M
pKb = - log( 1.8 x 10^-5) = 4.74
pOH = pKb + log [salt/base]
pOH = 4.74 + log (0.1875/ 0.5)
pOH = 4.33
pH = 14 - 4.33
pH = 9.67
The pH of the solution is obtained to be 9.67.
Learn more about pH:brainly.com/question/15289741
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Answer:
Scale Factor: 1 : 2
X = 11
Explanation:
3 / 3 = 1
6 / 3 = 2
The scale factor should be 1:2
So 'X' should be 11 since 5.5 * 2 = 11
