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Leni [432]
3 years ago
12

Perform the following

Chemistry
2 answers:
antoniya [11.8K]3 years ago
3 0

Answer: 0.5474

Explanation:

Romashka [77]3 years ago
3 0
Answer is 0.5474 all you have to do is multiply
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How do atomic mass and atomic number change across and dow the periodic table of elements?
finlep [7]
They both are increasing when moving down to the group......
7 0
4 years ago
How many grams are there in 3. 4 x 1024 molecules of nh3.
nadezda [96]

Answer:

69,632 grams

explanation

number of molecules =mass\molemass

nh3 14 +2×3=20

3.4×1024=m/20

cross multiply

grams =69,632

7 0
3 years ago
Among the following which solution is the most acidic?
Vika [28.1K]

i think it c i dont know if im right tho.

8 0
3 years ago
How many Joules of heat will be given off by 55.0g of water as it cools from 87.3°C to 25.0°C?
PSYCHO15rus [73]

Answer:

Q = -14322.77 J

Explanation:

Given data:

Mass of water = 55.0 g

Initial temperature = 87.3°C

Final temperature = 25.0 °C

Heat given off = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Specific heat capacity of water is 4.18 J/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 25.0 °C - 87.3°C

ΔT = - 62.3 °C

Q = 55.0 g×4.18 J/g.°C × - 62.3 °C

Q = -14322.77 J

5 0
3 years ago
Predict the sign of ΔSsys for each of the following processes. Which are positive? (a) Gasoline vapors mix with air in a car eng
OLEGan [10]

Answer:

Positive: a and b

Negative: c

Explanation:

The entropy (S) is the measure of the randomness of the system, and it intends to increase. The randomness can be determined by the energy of the molecules, their velocity and how distance they are between the other molecules.

When the entropy increases, ΔS is positive, when the entropy decreases, ΔS is negative. So, when gasoline mix with air in a car engine, the process intends to continue, the randomness increases and ΔS is positive. When hot air expands, the distance between the molecules increases, so ΔS is positive.

But, when humidity condenses, the molecules stay closer, so there's a decrease in the randomness, then ΔS is negative.

6 0
4 years ago
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