Answer:
1.5 × 10³ g
Explanation:
Step 1: Given and required data
- Transferred heat (Q): 41,840 J
- Initial temperature: 22.0 °C
- Final temperature: 28.5 °C
- Specific heat capacity of water (c): 4.184 J/g.°C
Step 2: Calculate the temperature change
ΔT = 28.5°C - 22.0 °C = 6.5 °C
Step 3: Calculate the mass (m) of water
We will use the following expression.
Q = c × m × ΔT
m = Q / c × ΔT
m = 41,840 J / (4.184 J/g.°C) × 6.5 °C = 1.5 × 10³ g
Answer
C. Difference in temperature
Explanation
According to thermodynamics, heat transfer occurs when heat from a high temperature reservoir moves to a low temperature reservoir. For heat to be transferred, the two objects should have different temperatures with one having more temperature than the other. Heat transfer in solids is by conduction, in fluids is by convection and by radiation.
<u>Answer:</u> The value of energy change is
<u>Explanation:</u>
To calculate the energy of one photon, we use Planck's equation, which is:
where,
h = Planck's constant =
c = speed of light =
= wavelength = 500 nm = (Conversion factor: )
Putting values in above equation, we get:
Hence, the value of energy change is
<u>Answer:</u> The number of moles of sugar that is used are 0.055 moles.
<u>Explanation:</u>
We are given:
Mass of 1 mole of sugar = 342 g
Mass of sugar used = 19 g
So, by applying unitary method, we get:
342 grams of sugar is making 1 mole
So, 19 grams of sugar will make =
Hence, the number of moles of sugar that is used are 0.055 moles.