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pashok25 [27]
3 years ago
10

Estimate: Press Reset. Select Atoms, and using the slider, start with 1.000 × 1023 atoms of sulfur. (Note that pressing Start pu

ts atoms into the atom counter, not the jars.)
Is this amount more or less than one mole?

Place the jar underneath the counter. Was the jar completely filled?

How many moles do you have?
Chemistry
1 answer:
solniwko [45]3 years ago
3 0

Answer:

1) The amount is less than one mole, 2) The jar is not completely filled, 3) We have 0.166 moles of sulfur.

Explanation:

We proceed to respond each question below:

1) <em>Is this amount more or less than one mole?</em>

According to the Avogadro's Number, one mole of an element contains about 6.022\times 10^{23} atoms. Given that we have 1.000\times 10^{23} atoms, then we conclude that this amount is less than one mole.

2) <em>Place the jar underneath the counter. Was the jar completely filled?</em>

Let suppose that the jar can contain up to a mole of sulfur. Then, we conclude that jar is not completely filled.

3) <em>How many moles do you have?</em>

The amount of moles is determined by dividing the current amount of atoms by Avogadro's Number:

x = \frac{1.000\times 10^{23}\,atoms}{6.022\times 10^{23}\,\frac{atoms}{mole} }

x = \frac{500}{3011}\,mole

We have 0.166 moles of sulfur.

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Explanation:

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3 years ago
A solution is made by combining 500 mL of 0.10 M HF (Ka=7.2 x 10^-4) with 300 mL of 0.15 M NaF. What is the pH of the resulting
n200080 [17]

Answer:

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Explanation:

HF ⇄ H + + F

Using Henderson-Hasselbalch Equation:

pH = pKa + log [A-]/[HA].

Where;

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[HA] = concentration of the acid = moles of acid/total volume

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                    = 0.0625 M

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<em>a) 2.97 </em>

<em>b) 3.10 </em>

<em>c) 3.19 </em>

<em>d) 3.22 </em>

<em>e) 3.32</em>

The correct option is b.

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<h2>Hello!</h2>

The answer is:

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<h2>Why?</h2>

To calculate the percent yield, we have to consider the theoretical yield and the actual yield. The theoretical yield as its name says is the yield expected, however, many times the difference between the theoretical yield and the actual yield is notorious.

We are given that:

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Now, to calculate the percent yield, we need to divide the actual yield by the theoretical and multiply it by 100.

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Hence, we have that the percent yield of the reaction is 32.45%.

Have a nice day!

8 0
3 years ago
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