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Anvisha [2.4K]
2 years ago
15

13. Describe briefly how you figured out what the name of the element is:

Chemistry
1 answer:
zloy xaker [14]2 years ago
7 0
Answer:
13) between the nucleus, there is a proton and electron number given, (looking at the periodic table, it gives you the name of the element)

14) an ion, in any element has a POSITIVE charge no matter what.. the numbers depend on what it element the ion is with..
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Calculate the molarity when 135 g of KCl is dissolved to make a 2.50 L solution. Round to two significant digits.
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<h2>0.72 mol/L</h2>

Explanation:

       \textrm{Molarity of a solution}=\frac{\textrm{Number of moles of solvent}}{\textrm{Volume of solution in Liters}}

       We are given a 2.50L solution which contains 135g of KCl.

       To calculate number of moles of KCl present, we need to find it's molar mass from charts. Molar Mass of KCl is known to be 74.55\frac{g}{Mol}.

       Number of moles of KCl present = \frac{\textrm{Given weight}}{\textrm{Molar Mass}}\textrm{ = }\frac{135g}{74.55\frac{g}{Mol}}\textrm{ = }1.81087mol

       Molarity = \frac{1.81087mol}{2.50L}=0.7243\frac{mol}{L}

∴ Molarity of given KCl solution = 0.72\frac{mol}{L}

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3 years ago
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