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Marysya12 [62]
3 years ago
8

What is the molecular weight (rmm) of NaOH? 40 20 50 60

Chemistry
1 answer:
Molodets [167]3 years ago
4 0

Answer: A/40 it is actually 39.997 but since that is not an answer they rounded up

Explanation:

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If 0.60 L of a solution contains 6.6 g of NaBr, what is its molar concentration?
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Answer:

Molarity = moles ÷ liters

to get moles of NaBr divide grams of NaBr by its molar mass (mass of Na + mass of Bromine)

Na = 22.989769

Br = 79.904

molar mass of NaBr = 102.893769

6.6g ÷ 102.893769 = 0.064143826 moles of NaBr

0.064143826 moles ÷ 0.60 liters = 0.1069 molar concentration or 11 %

7 0
3 years ago
In the reaction H2SO4 + 2 NaOH -> Na2SO4 + 2H2O, an equivalence point occurs when 29.43 mL of 0.1973 M NaOH is added to a 32.
Tamiku [17]
            moles NaOH = c · V = 0.1973 mmol/mL · 29.43 mL = 5.806539 mmol
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Hence
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The answer to this question is  [H2SO4] = 0.08955 M

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3 years ago
The electron configuration of an element is 1s2 2s2 2p1. How many valance electrons does the element have. 1,2,3 or 4
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3

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Your answer is C. Both gasoline and litter would need to be physically separated from the water, because neither bonds with the water.


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The primary role of the carbonic-acid-bicarbonate buffer system is to
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The primary role of the carbonic-acid-bicarbonate buffer system is to neutralize the hydronium ions forming carbonic acid and water when any acidic substance enter the bloodstream.

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hope it helps.

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