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Semenov [28]
3 years ago
10

Help me find the answer please

Chemistry
2 answers:
Brilliant_brown [7]3 years ago
7 0
Whew chile i dont even know-
Alex3 years ago
7 0

Answer:

1. A

2. C

3. B

4. G

5. H

6. D

7. F

8. E

Explanation:

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In going from room temperature (25 C) to 10 C above room temperature, the rate of reaction doubles. Calculate the activation ene
Sauron [17]

Answer:

Ea=5.29 × 10⁴ J/mol

Explanation:

In going from 25 °C (298 K) to 35 °C (308 K), the rate of the reaction doubles. Since the rate of the reaction depends on the rate constant (k), this implies that the rate constant doubles. We can find the activation energy (Ea) using the two-point form of the Arrhenius equation.

ln\frac{k_{2}}{k_{1}} =\frac{-Ea}{R} .(\frac{1}{T_{2}}-\frac{1}{T_{1}})\\ln\frac{2k_{1}}{k_{1}}=\frac{-Ea}{8.314J/K.mol}.(\frac{1}{308K}-\frac{1}{298K} )\\Ea=5.29 \times 10^{4} J/mol

8 0
2 years ago
Sodium chloride (NaCl) is commonly used to melt ice on roads during the winter. Calcium chloride (CaCl2) is sometimes used for t
mihalych1998 [28]

Answer:

\Delta Tfp_{NaCl}= -14.0\°C\\\\\Delta Tfp_{CaCl_2}=-11.1\°C

Explanation:

Hello!

In this case, since the freezing point depression caused by the addition of a solute, we use the following formula:

\Delta Tfp= i*m*Kfp

Thus, we first need to compute the molality of each solute, as shown below:

m_{NaCl}=\frac{220.g/(58.44g/mol)}{1.00kg} =3.76m\\\\m_{CaCl_2}=\frac{220.g/(110.98g/mol)}{1.00kg} =1.98m

Next, since NaCl has two ionic species, one Na⁺ and one Cl⁻, and CaCl₂ three, one Ca²⁺ and two Cl⁻, the van't Hoff's factors are 2 and 3 respectively, therefore the freezing point depressions turn out:

\Delta Tfp_{NaCl}= 2*3.76m*-1.86\°C/m=-14.0\°C\\\\\Delta Tfp_{CaCl_2}= 3*1.98m*-1.86\°C/m=-11.1\°C

It means that CaCl₂ is still better than NaCl because produces involves a higher melting point for the ice, so it would melt faster.

Best regards!

3 0
3 years ago
New York State is located in which two hemispheres? How do you know this?
Helen [10]
Well, every location is located in two hemispheres. New York is in the north western hemisphere. North of the equator and west of the prime meridian
3 0
3 years ago
A swimming-pool worker wants the pool's pH to be 7.2. She comes by to test the water and finds that the pH is 8.2. What should s
PtichkaEL [24]
The pH of a solution is a measure of the acidity of a solution and is logarithmically related to the hydrogen ion concentration. It is expressed as:

pH = -log [H+]

We use this to determine the amount of H+ needed to adjust the pH to the desired value.

pH1 = 7.2 = -log [H+]
[H+] = 6.31x10^-8

pH2 = 8.2 = -log [H+]
[H+] = 6.31x10^-9

[H+] to be added =  6.31x10^-8 - 6.31x10^-9 = 5.68x10^-8 M

She should add an acidic solution with concentration 5.68x10^-8 M. Hope this helps.
3 0
3 years ago
Read 2 more answers
How many grams of ammonia (NH3) will produce<br> 300 grams of N2?<br> 4NH3 + 6NO → 5N2 + 6H2O
jeka57 [31]
Molar mass

NH3 = 17 g/mol
N2 = 28 g/mol

4 NH3 + 6 NO = 5 N2 + 6 H2O

4 x 17 g NH3 ------------ 5 x 28 g N2
?? g NH3 --------------- 300 g N2

300 x 4 x 17 / 5 x 28 =

20400 / 140 => 145.71 g of NH3


6 0
3 years ago
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