False. elements in the same period have the same number of shells while elements in the same group have the same number of valence electrons.
(16.3 L) / (22.414 L/mol) x (4.0026 g He/mol) = 2.91 g
65 grams of HCl = 65/36.5 moles of HCl = 1.78 moles
1.78 moles of HCl dissolved to make a 5 litres of solution has a concentration of 1.78/5 = 0.36 mol/dm^3 (Note: 1 litre = 1 cubic decimetre)
In a strong acid, such as HCl, [H+] = [acid], so [H+] = 0.36
To calculate pH, we have to take the negative logarithm of the concentration of protons
So, -log(0.36) = 0.45
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Answer:
Explanation:
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