Of the following given choices;
A. iron
B. plastic
C. aluminum
D. wood
The answer is; A
Magnetism is the result from the unpaired spins of electrons in the orbital shells of the atoms of an element. Aluminum (though a metal with +3 valency like iron) has it S and P orbitals filled hence most of its electrons are paired. Iron, on the other hand, a transitional metal, has a D orbital that can be filled before the P orbital is filled. Therefore, there is a higher net unpaired spin of electrons giving the atoms net magnetic properties.
The final temperature (°C) of the air at this elevation is 326.3K.
<h3>How to calculate temperature?</h3>
The temperature of a gas can be calculated using the combined gas law equation as follows:
P₁V₁/T₁ = P₂V₂/T₂
Where;
- P₁ = initial pressure
- V₁ = initial volume
- T₁ = initial temperature
- P₂ = final pressure
- V₂ = final volume
- T₂ = final temperature
According to this question, 1.20L weather balloon on the ground has a temperature of 25.0°C and is at atmospheric pressure (1.00 atm). When it rises to an elevation where the pressure is 0.730 atm, then the new volume is 1.80L. The final temperature can be calculated thus:
1 × 1.2/298 = 0.730 × 1.8/T₂
0.004027T = 1.314
T = 326.3K
Therefore, 326.3K is the final temperature of the balloon.
Learn more about combined gas law at: brainly.com/question/2441080
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Formula to find the percent composition of an element in a compound is
.
Now enter the variables into the formula.
%
Round to 3 significant figures. 15.897% = 15.9%
The answer is 15.9% H