Answer:
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Explanation:
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The chemical properties are mainly dependent on the electrons, or in some cases the charge of the protons, which is independent of the number of neutrons.So,they are arranged by increasing atomic number…
I don't know much about this, but probably the reason why your teacher circled 300k is because of what's in the photo below. If you couldn't tell from the photo, its because 300k isn't negative. Anyway this is my guess, based on my limited knowledge.
Answer:
The molarity of a 50.0 ml aqueous solution containing 10.0 grams of table sal, Nacl, is 3.42
Explanation:
Molarity is a unit of concentration based on the volume of a solution and is defined as the number of moles of solute per liter of solution. Then, the molarity of a solution is calculated by dividing the moles of the solute by the liters of the solution.
Molarity is expressed in units ().
Then you must know the amount of moles of the NaCl solute. For that it is necessary to know the molar mass. Being:
-
Na: 23 g/mole
- Cl: 35.45 g/mole
the molar mass of NaCl is: 23 g/mole + 35.45 g/mole= 58.45 g/mole
Then a rule of three applies as follows: if 58.45 grams are present in 1 mole of NaCl, 10 grams in how many moles will they be?
moles= 0.171
So you know:
- number of moles of solute= 0.171 moles
- volume= 50 mL= 0.05 L
Replacing in the definition of molarity:
Solving:
Molarity= 3.42
<u><em>The molarity of a 50.0 ml aqueous solution containing 10.0 grams of table sal, Nacl, is 3.42 </em></u><u><em></em></u>