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lorasvet [3.4K]
3 years ago
11

What are the Number of molecules of 14 grams of NO2

Chemistry
1 answer:
algol [13]3 years ago
5 0

6.022 x 1023 atoms are in 14 grams of NO2

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How much arsenic does it take to kill a rat
Diano4ka-milaya [45]

Answer:

The average estimated fatal dose of arsenic trioxide for humans is 125 mg. For a 70-kg man, this is equivalent to about 1.4 mg of arsenic per kilogram of body weight.

7 0
3 years ago
The solubility of acetanilide is 12.8 g in 100 mL of ethanol at 0 ∘C, and 46.4 g in 100 mL of ethanol at 60 ∘C. What is the maxi
weqwewe [10]

Answer: 72.41% and 26.90% respectively.

Explanation:

At 60°C, you can dissolve 46.4g of acetanilide in 100mL of ethanol. If you lower the temperature, at 0°C, you can dissolve just 12.8g, which means (46.4g-12.8g)=33.6g of acetanilide must have precipitated from the solution.

We can calculate recovery as:

\%R=\frac{crystalized\ mass}{initial\ mass}*100 =\frac{33.6\ g}{46.4\ g}*100=72.41\%

So the answer to the first question is 72.41%.

For the second part just use the same formula, the mass of the precipitate is the final mass minus the initial mass, (171mg-125mg)=46mg.

\%R=\frac{crystalized\ mass}{initial\ mass}*100 =\frac{46\ mg}{171\ mg}*100=26.90\%

So the answer to the second question is 26.90%.

3 0
3 years ago
This electron cloud model of aluminum has _______ energy levels with _______ electrons on its outer energy level. A) 1, 2 B) 2,
Talja [164]

Answer:

C

Explanation:

Have anice day

7 0
3 years ago
Solve the equation 5m+4=7m+6​
ioda
The equation of 5m+4=7m+6 is equal to m=-1
7 0
3 years ago
If a light bulb is missing or Broken in a parallel circuit,will the other bulb light
umka2103 [35]
Yes, if it’s a parallel circuit the wires are two different wires so it will light because that bulb isn’t connected to the one that went out
5 0
3 years ago
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