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3 years ago

Very urgent/easy chem question easy points

Chemistry

2 answers:

aev [14]3 years ago

8 0

Sodium chloride is the answer

Minchanka [31]3 years ago

4 0

Your answer would be sodium chloride.

I hoped I helped and if you need more you could always ask me :)

-Dawn

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Which of the following is the abbreviation for an SI unit of mass? A. kg B. m C. s D. °C

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Kg is the abbreviation for an SI unit of mass, which is kilogram

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The energy of motion is called

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What amount of heat is removed to lower the temperature of 80 grams of water from 75º C to 45º C? The specific heat of liquid wa

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Answer:The correct answer option A.

Explanation:

$Q= m\times c\times \Delta T$

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3 years ago

2. If the reaction of 5.75 moles of sodium with excess hydrofluoric acid is able to produce 2.49 mol H2, what is the percent yie

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Answer:

86.5%

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

2Na + 2HF –> 2NaF + H2

Next, we shall determine the theoretical yield of the hydrogen gas, H2. This is illustrated:

From the balanced equation above,

2 moles of Na reacted to produce 1 mole of H2.

Therefore, 5.75 moles of Na will react to produce = (5.75 x 1)/2 = 2.88 moles of H2.

Therefore, the theoretical yield of Hydrogen gas, H2 is 2.88 moles.

Finally, we shall determine the percentage yield of Hydrogen gas, H2. This can be obtained as follow:

Actual yield of H2 = 2.49 moes

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Percentage yield of H2 =.?

Percentage yield = Actual yield /Theoretical yield x 100

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Percentage yield = 86.5%

Therefore, the percentage yield of Hydrogen gas, H2 is 86.5%.

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