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coldgirl [10]
3 years ago
11

During the summer after your first year at Carnegie Mellon, you are lucky enough to get a job making coffee at Starbucks, but yo

u tell your parents and friends that you have secured a lucrative position as a ‘java engineer.’ An eccentric chemistry professor stops in every day and orders 250 ml of house coffee at precisely 95*C. He then adds enough milk at 4*C to drop the temperature of the coffee to 90*C.
Calculate the amount of milk, in ml, the professor must add to reach this temperature. Show all of your work including equations and units. Assume coffee and milk have the same specific heat capacity of 4.186 J/g*C and density of 1.0 g/ml.

Step 1: Write down what is given to you in the problem
Initial temp of coffee = 95*C
Final temp = 90*C
Specific heat capacity of coffee and milk= 4.186 J/g*C
Density = 1.0 g/ml
Initial Temp of milk = 4*C

Step 2: Calculate how much energy the coffee loses when being cooled down from 95*C to 90*C. (q = C x m x Δ T) (3 points)





Step 3: Calculate the mass of milk needed to cool down the coffee using the same equation as in step 2 (you must rearrange it to solve for mass). The change in temperature is going to be the final temp of the coffee/milk mixture minus the temp of the milk. (4 points)






Step 4: Use the density of the milk to calculate to milliliters of milk needed. This is your answer. (1 point)
Chemistry
1 answer:
docker41 [41]3 years ago
6 0

Answer:

did you ever get the answer to this?

Explanation:

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Answer:

Moving Across a Period

Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons

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Consider this reaction:
nadya68 [22]
11.7 g hope this helps and have a great day
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KClO3 (s) KCl (s) + 02 (g)​<br><br><br>How do you balance this equation
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2KCl(s) + 6O3O2

Explanation:

I think it's correct

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3 years ago
why are plasmas of great interest to scientists or manufacturers. descride 2 current uses of plasmas and describe 1 way scientis
Helga [31]

<u>Answer:</u>

<u>Plasmas of great interest to scientists or manufacturers as</u>

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6 0
3 years ago
Some people must eat a low-sodium diet with no more than 2,000 mg of sodium per day. By eating 1 cracker, 1 pretzel, and 1 cooki
Leni [432]

Answer:

The amount of sodium is 32 mg per cracker, 49 mg per pretzel and 68 mg per cookie.

Explanation:

Let's assume amount of sodium is x mg per cracker, y mg per pretzel and z mg per cookie.

So, the following three equations can be written as per given information:

x+y+z = 149 ........(1)

8y+8z = 936 ........(2)

6x+7y = 535 .........(3)

From equation- (2), y+z = \frac{936}{8} = 117

By substituting the value of (y+z) in equation- (1) we get,

                          x = 149-(y+z) = 149-117 = 32

By substituting the value of x into equation- (3) we get,

                           y = \frac{535-(6\times 32)}{7} = 49

By substituting the value of y  into equation- (2) we get,

                           z = (117-49) = 68

So, the amount of sodium is 32 mg per cracker, 49 mg per pretzel and 68 mg per cookie.

6 0
3 years ago
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