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vazorg [7]
3 years ago
11

Mistry- Unit 5 Test 1 33 of 50

Chemistry
1 answer:
vodka [1.7K]3 years ago
6 0

Answer:

∆H fus = -∆H solid

Explanation:

Enthalpy of melting (fusion) is the enthalpy change when a substance melts. It is always endothermic (i.e heat is being absorbed). So ∆H is positive.

Enthalpy of freezing (solidification) is the enthalpy change when a substance freezes. It is negative that of melting.

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Cassini has a mass of 2523 kg, and Saturn
Amiraneli [1.4K]

The F is 2.980 x 104 N  gravity Gm1 is  2523 kg m₂ is 5.68 x 1026 kg and radius 54,364 km and height is 108,728 km.

<h3>What is gravity?</h3>

Gravity is the amount of force that is produced by the earth to attract the object toward the surface and it doubles if the mass is double.

The height of Saturn is the duble of the radius of the given radius of 54,364 km of the planet Saturn which is 108,728 km.

Therefore,  F is 2.980 x 104 N  gravity Gm1 is  2523 kg m₂ is 5.68 x 1026 kg and radius 54,364 km and hight is 108,728 km.

Learn more about gravity, here:

brainly.com/question/4783082

#SPJ1

4 0
2 years ago
Carbon-14 is a radioactive isotope which decays with a half-life of 5730 years. what is the first-order rate constant for its de
marishachu [46]
In chemical equilibrium, radioactive decay occurs because of unstability due to the high neutron-to-proton ratio. Through time, the radioactive element is converted to a new element. This radioactive decay undergoes first order reaction. Its equation is in the form of 

A = A₀e^(-kt), where A is the amount of the element after time t, A₀ is the original amount of element at t=0 and k is the rate constant. 

Half-life is the amount of time for A to be 1/2 of A₀. Modifying the equation during half time, we let A=1/2 A₀. Then.

1/2 A₀ = A₀e^(-kt)
1/2 = e^(-k(5730))
k = 0.000121

Thus, the first-order rate constant is equal to 0.000121 per year.


4 0
3 years ago
What volume (in mL) will a sample of F2 gas occupy in a syringe at 5.5 atm, if the F2 has a volume of 25.0 mL at 1.2 atm?
Paha777 [63]

Answer:

5.45mL

Explanation:

Using Boyle's law equation:

P1V1 = P2V2

Where; P1 = initial pressure

P2 = final pressure

V1 = initial volume

V2 = final volume

According to this question, P1 = 1.2atm, V1 = 25mL, P2 = 5.5atm, V2 = ?

1.2 × 25 = 5.5 × V2

30 = 5.5V2

V2 = 30/5.5

V2 = 5.45mL

Therefore, 5.45 mL sample of F2 gas will occupy a syringe at 5.5atm.

7 0
3 years ago
What amount of carbon dioxide (in moles) is produced from the reaction of 2.24 moles of ethanol with excess oxygen?
algol13

Answer : The amount of carbon dioxide produced is, 197.12 grams.

Explanation : Given,

Moles of ethanol = 2.24 mole

Molar mass of carbon dioxide = 44 g/mole

The balanced chemical reaction will be,

C_2H_5OH+3O_2\rightarrow 2CO_2+3H_2O

First we have to calculate the moles carbon dioxide.

From the balanced chemical reaction, we conclude that

As, 1 mole of ethanol react to give 2 moles of carbon dioxide

So, 2.24 mole of ethanol react to give 2\times 2.24=4.48 moles of carbon dioxide

Now we have to calculate the mass of carbon dioxide.

\text{Mass of }CO_2=\text{Moles of }CO_2\times \text{Molar mass of }CO_2

\text{Mass of }CO_2=4.48mole\times 44g/mole=197.12g

Therefore, the amount of carbon dioxide produced is 197.12 grams.

8 0
3 years ago
(2.22 x 10^6cm) x (5.5 x 10^-5m) answer in scientific notation.
lorasvet [3.4K]

Answer:

12.21 x 10⁻¹ m

Explanation:

Given:

(2.22 x 10⁶cm) x (5.5 x 10⁻⁵m)

Find:

Solution;

Computation:

(2.22 x 10⁶cm) x (5.5 x 10⁻⁵m)

[2.22 x (10⁶/100)m] x (5.5 x 10⁻⁵m)

[2.22 x 10⁴m] x (5.5 x 10⁻⁵m)

12.21 x 10⁻¹ m

5 0
3 years ago
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