The answer: A
Explanation: fossil fuels need to be burned to release the energy stored in them, Which leads to smoke casting cans gas being pumped into the air. Unfortunately, burning fossil fuels Releases harmful particles and greenhouse gases into the atmosphere, resulting in adverse affects humans and earth as a whole.
Answer: It gets wasted in various forms.
Explanation: The most common way of this energy being wasted is called "waste heat".
Waste heat is the unused heat given to the surrounding environment (in the form of thermal energy) by a heat engine in a thermodynamic process (like a chemical reaction as you said) in which it converts heat to useful work.
For each compound, i.e. galena, cerussite and anglesite calculate the quantity of Pb contained.
For that, you need to use the molecular formula and the atomic weights of the elements.
Galena, PbS
Atomic weights
Pb: 207 uma
S: 32 uma
Molar mass = 207 + 32 = 239 g/mol
Proportion of Pb in the compound = 207/239
% of Pb from galena: 38.0% * [207/239]
Cerussite
Pb CO3
Atomic weights
Pb: 207
C: 12
O: 16
Molar mass = 207 + 12 + 3*16 = 267 g/mol
% of Pb coming from the cerussite
25.0% * [207/267]
Anglesite, PbSO4
Molar mass: 207 + 32 + 4*16 = 303 g/mol
% of Pb coming from anglesite = 17.4% * [207/303]
Total quantity of Pb from the rock (call X the quantity of rock)
[38.0%*207/239 + 25.0%*207/267 + 17.4%*207/303]*X.
And that must be equal to 5.8 metric tons = 5800 kg
The result of the calculations are:
[32.91% + 19.38% + 11.89%]X = 5800 KG
64.18% X = 5800 KG
0.6418 X = 5800 KG
X = 5800 / 0.6418
X = 9037 KG
Which you have to express with two significan figures, i.e. 9000 kg
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Hello there!
How is density different from weight and mass you say? It's simple!
1. Unlike weight, density is composed of mass and volume.
2. By dividing the mass over the volume, you can determine an object's density, while weight is the product of mass and gravity.
Hope this helps :) if so, can I get Brainliest?