The specific heat capacity of sand is much less than water because of which sands require less energy to cool down and similarly less energy to be heated... because of this it feels like sands absrob heat faster than water
Answer:
65.4%
Explanation:
The redox reaction is a 1:1:1 reaction because the reagents suffer a double displacement reaction, and the substance that is substituted have the same charge (H+ and Br-), thus, we first need to know which of the reagents is the limiting.
Let's test the 4-nitrobenzaldehyde as the limiting. The mass needed for sodium borohydride (m) is the mass given of 4-nitrobenzaldehyde multiplied by the stoichiometric mass of sodium borohydride divided by the stoichiometric mass of 4-nitrobenzaldehyde. The stoichiometric mass is the number of moles in the stoichiometric representation (1:1:1) multiplied by the molar mass, so:
m = (4.13 * 37.83*1)/(151.12*1)
m = 1.034 g
So, the mass needed of the other reagent is larger than the mass that was given, so, it will be the limiting, and the stoichiometric calculus must be done with it.
The mass of the product that was expected is then:
m = (0.700*153.14*1)/(37.83*1)
m = 2.83 g
The percent yield is the mass that was formed divided by the expected mass, and then multiplied by 100%:
%yield = (1.85/2.83)*100%
%yield = 65.4%
The pros of nuclear energy is the high power output generated while the cons is the damage the waste causes to organisms.
<h3>What is Nuclear energy?</h3>
This process involves the use of nuclear reactions such as fusion and fission to generate electricity.
It produces a high amount of power needed to cover a large population nut the disadvantage is that the waste can alter the genetic composition in organisms thereby resulting in mutation.
Read more about Nuclear energy here brainly.com/question/11963586
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Answer:
Because due to the presence air resistance
The mass of the sample is 84.3 g
<u>Explanation:</u>
We have the formula to find the mass
Q = mCΔT
where
Q denotes the energy absorbed or released
m denotes the mass of the sample
C denotes the Specific heat of sample
Δ
T denotes the
Temperature change
Q = mCΔT
Rewrite the equation as,
m
=
Q/
C
Δ
T
m=24000 J/4.186 J/g°C×
( 69.5 °C-0°C)
m=82.42
m=84.3 (based on the options)
The mass of the sample is 84.3 g
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