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Svetlanka [38]
3 years ago
5

Please I need help with questions 5-9 and it’s very hard and I’m struggling with it and if you need to see the picture big then

click on it and it will be big and I need help plotting the letters in to the Punnet square for questions 5-9

Chemistry
1 answer:
Serggg [28]3 years ago
3 0
"the answer will be 0.00 "
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The molar heat of vaporization of water is 40.7kJ/mol. How much heat must be absorbed to convert 50.0 grams of liquid water at 1
EleoNora [17]
During a phase change the temperature does not change since all of the heat is being absorbed in order to break the intermolecular forces.  Due to that, the formula will not need to have T in it and is actually q=nΔH(v).
n=the number of moles (in this case 2.778mol of water since you divide 50g by 18g/mol).
ΔH(v)=the molar heat of vaporization (in this case 40.7kJ/mol).
q=the heat that must be absorbed
q=2.778mol×40.7kJ/mol
q=113.1kJ
Therefore the water needs to absorb 1.13×10²kJ.

I hope this helps.  Let me know if anything is unclear.

4 0
3 years ago
fish tank initially contains 35 liters of pure water. Brine of constant, but unknown, concentration of salt is flowing in at 5 l
weeeeeb [17]

Answer:

Therefore, the rate of change in the amount of salt is \frac{dx}{dt} =( 5c}{ - \frac{x }{20})

\frac{grams }{min}

Explanation:

Given:

Initial volume of water V = 35 lit

Flowing rate = 5 \frac{Lit}{min}

The rate of change in the amount of salt is given by,

   \frac{dx}{dt} = ( Rate of salt enters tank - rate of sat leaves tank )

Since tank is initially filled with water so we write that,

x(0) = 0

Let amount of salt in the solution is c,

  \frac{dx}{dt} = \frac{5c}{1 } - \frac{x(t) \times 5}{100}

  \frac{dx}{dt} =( 5c}{ - \frac{x }{20}) \frac{grams}{min}

Therefore, the rate of change in the amount of salt is \frac{dx}{dt} =( 5c}{ - \frac{x }{20})

\frac{grams }{min}

7 0
3 years ago
What powers explosions and fire?
docker41 [41]

Answer:

Oxygen

Explanation:

I'm not completely sure about the explosion part but I know oxygen fuels fire.

4 0
3 years ago
Which of the following numbers will produce the same number when rounded to two significant figures? (2.3)
prohojiy [21]
2.10

The 0 after 1 is not significant and does not affect the value of the number; therefore, when the number will be rounded to two significant figures, it will become 2.1, so it will be the same.
8 0
3 years ago
How many deciliters are in 8.12 decaliters?
statuscvo [17]
812 deciliters is the correct answer that you are looking for.
8 0
3 years ago
Read 2 more answers
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