Pls help me pls cuz i need a good grade

Which of the water samples described below has the greatest average kinetic energy per molecule? A. 1 liter of water at a temper

Triss [41]

Answer:

A. 1 liter of water at temperature 75°C

Explanation:

According to kinetic molecular theory average kinetic energy of molecules are directly proportional to absolute temperature.

the quantity of the sample does't depend on kinetic energy only temperature

does so the choice with highest temperature is the correct choice

∵ 1 liter water at 75°C has highest average kinetic energy per molecule

5 0

4 years ago

6. How many moles of water would require 92.048 kJ of heat to raise its temperature from 34.0 °C to 100.0 °C? (3 marks)

scoray [572]

Taking into account the definition of calorimetry, 0.0185 moles of water are required.

<h3>Calorimetry</h3>

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

<h3>Mass of water required</h3>

In this case, you know:

Heat= 92.048 kJ
Mass of water = ?
Initial temperature of water= 34 ºC
Final temperature of water= 100 ºC
Specific heat of water = 4.186 $\frac{J}{gC}$

Replacing in the expression to calculate heat exchanges:

92.048 kJ = 4.186 $\frac{J}{gC}$ × m× (100 °C -34 °C)

92.048 kJ = 4.186 $\frac{J}{gC}$ × m× 66 °C

m= 92.048 kJ ÷ (4.186 $\frac{J}{gC}$ × 66 °C)

<u><em>m= 0.333 grams</em></u>

<h3>Moles of water required</h3>

Being the molar mass of water 18 $\frac{g}{mole}$ , that is, the amount of mass that a substance contains in one mole, the moles of water required can be calculated as:

$amount of moles=0.333 gramsx\frac{1 mole}{18 grams}$

<u><em>amount of moles= 0.0185 moles</em></u>

Finally, 0.0185 moles of water are required.

Learn more about calorimetry:

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8 0

3 years ago

Which of the following would absorb the most sunlight?

MrRa [10]

The tshirt that is going to absorb most amount of sunlight is the black t-shirt. This is because its reflectivity is almost zero that it is not capable of reflecting back the light to the surface. This is the very reason why we are feeling so warm when we wear a black t-shirt.

6 0

3 years ago

Question 3

aleksklad [387]

Answer:

The reverse reaction will increase.

Explanation:

If you increase amount of product of reaction, then reverse reaction will increase, and more H2 and O2 will be formed.

6 0

4 years ago

3. What identifies an element?

Anna007 [38]

Answer: Atomic number

Explanation: Atomic numbers never change, they stay the same which is why they are what elements are identified by

5 0

3 years ago