Preston goes on a camel safari in Africa. He travels 5km north, then 3km south and then 1km north again. What distance did he co
ver? What was his displacement?
1 answer:
Answer:
<u>Distance:</u> 9 km
<u>Displacement:</u> 3 km
Explanation:
Distance takes into account the entire path that, in this case, Preston walked, while displacement, considers only the difference between the initial and final point.
In the picture, the different paths represent as a whole the distance he covered (5+3+1), whereas, the start and final point represent displacement (3-0)
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Answer : The must be administered.
Solution :
As we are given that a vial containing radioactive selenium-75 has an activity of .
As, 3.0 mCi radioactive selenium-75 present in 1 ml
So, 2.6 mCi radioactive selenium-75 present in
Conversion :
Therefore, the must be administered.
The question is incomplete, here is the complete question:
The given chemical reaction is:
What is the theoretical yield of Calcium if we begin with 12.6 grams of Aluminium?
<u>Answer:</u> The theoretical yield of copper is 44.48 grams
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
.....(1)
Given mass of aluminium = 12.6 g
Molar mass of aluminium = 27 g/mol
Putting values in equation 1, we get:
The given chemical equation follows:
By Stoichiometry of the reaction:
2 moles of aluminium produces 3 moles of copper
So, 0.467 moles of aluminium will produce = of copper
Now, calculating the mass of copper from equation 1, we get:
Molar mass of copper = 63.5 g/mol
Moles of copper = 0.7005 moles
Putting values in equation 1, we get:
Hence, the theoretical yield of copper is 44.48 grams