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-BARSIC- [3]
3 years ago
6

The nutritional information on a cereal box shows that one serving of dry cereal has 90 calories (actually kilocalories). If one

were to burn a serving of cereal, the amount of heat given off would be sufficient to raise the temperature of 1 kg of water how many degrees Celsius?
Chemistry
2 answers:
jarptica [38.1K]3 years ago
4 0

Answer:

Δt = 90.00 °C

Explanation:

The nutritional information on a cereal box shows that one serving of dry cereal has 90 calories (actually kilocalories) so

The amount of heat is 90.00 Kcal

Q= 90000 cal

The mass of water is m = 1 kg = 1000 g  

There is a formula that relates the amount of heat, the mass and the temperature variation :

Q = C.m.Δt

Where Q is the amount of heat, m is the mass,Δt is the temperature variation and finally C is the Specific heat (in this case C=Water specific heat)

C(Water) = 1.00 (cal/g.°C)

Q = C.m.Δt

90000 cal = 1.00 (cal/g.°C). 1000 g .Δt

Solving, Δt = 90.00 °C

Be aware of having all in congruent units. Also, we are supposing that water is in solid state.Otherwise, C(Water) ≠ 1.00 (cal/g.°C)

bogdanovich [222]3 years ago
3 0

Answer:

90 degrees Celsius

Explanation:

A calorie is the amount of energy needed to raise the temperature of 1 gram of water 1 degree Celsius.

A kilocalorie is 1000 calories

90kilocalories = 90 x 1000 = 90000 calories

1 kg = 1000 grams

temperature = calories/ grams = 90000/1000 = 90 degrees Celsius

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5 0
3 years ago
Can someone help me with this?
Anvisha [2.4K]
With what? I don’t see a photo or such.
8 0
2 years ago
What is the empirical formula for a compound that is 29.44\% calcium, 23.55% sulfur, and 47.01% oxygen? This compound is a commo
PSYCHO15rus [73]

Answer:

Empirical formula is CaSO₄.

Explanation:

Given data:

Percentage of calcium =29.44%

Percentage of sulfur = 23.55%

Percentage of oxygen = 47.01%

Empirical formula = ?

Solution:

Number of gram atoms of Ca = 29.44 / 40 = 0.74

Number of gram atoms of S = 23.55 / 32 = 0.74

Number of gram atoms of O = 47.01 / 16 = 3

Atomic ratio:

            Ca                      :        S                :         O

           0.74/0.74           :     0.74/0.74      :       3/0.74

               1                     :          1              :          4

Ca : S : O = 1 : 1 : 4

Empirical formula is CaSO₄.

3 0
3 years ago
When a 2.00 g sample of KCl is dissolved in water in a calorimeter that has a total heat capacity of 1.28 kJ ⋅ K − 1 , the tempe
Alchen [17]

Answer : The molar heat of solution of KCl is, 17.19 kJ/mol

Explanation :

First we have to calculate the heat of solution.

q=c\times (\Delta T)

where,

q = heat produced = ?

c = specific heat capacity of water = 1.28kJ/K

\Delta T = change in temperature = 0.360 K

Now put all the given values in the above formula, we get:

q=1.28kJ/K\times 0.360K

q=0.4608kJ=460.8J

Now we have to calculate the molar heat solution of KCl.

\Delta H=\frac{q}{n}

where,

\Delta H = enthalpy change = ?

q = heat released = 460.8 J

m = mass of KCl = 2.00 g

Molar mass of KCl = 74.55 g/mol

\text{Moles of }KCl=\frac{\text{Mass of }KCl}{\text{Molar mass of }KCl}=\frac{2.00g}{74.55g/mole}=0.0268mole

Now put all the given values in the above formula, we get:

\Delta H=\frac{460.8J}{0.0268mole}

\Delta H=17194.029J/mol=17.19kJ/mol

Therefore, the molar heat of solution of KCl is, 17.19 kJ/mol

7 0
3 years ago
4. Can 200 ml of fluid be transferred to a 1-quart container? Explain the process that you used to arrive at your answer.
sukhopar [10]

Answer:

  • <u><em>Yes, 200 ml of fluid can be transferred to a 1-quart container.</em></u>

Explanation:

You must compare the two volumes, 200 ml and 1 quart. If 200 ml is less than or equal to 1 quart, then 200 ml of fluid can be transferred to a 1-quart container, else it is not possible.

To compare, the two volumes must be on the same system of units.

Quarts is a measure of volume equivalent to 1/4 of gallon.

One gallon is approximately 3.785 liters.

3.785 liter = 3.785 liter × 1,000 ml/liter

Then, to convert 1 quart to ml use the unit cancellation method:

  • (1/4)gallon × 3.785 liter/gallon × 1,000ml / liter = 946.25 ml

Thus, you get that a 1-quart container has volume of 946.25 ml, which allows that 200ml of fluid be transferred to it.

7 0
3 years ago
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