<h3>a) Species change over time; some traits become more common, others less. This process of change is driven by natural selection. The traits that become more common are the ones that are “adaptive” or “increase fitness” (that is, a creature's chances of living longer and producing more offspring).</h3>
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Answer:
C)
Explanation:
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The balanced chemical reaction is:
C4H10 + 5O2 = 4CO2 + 2H2O
We are given the amount of butane to be used in the reaction. This will be the starting point of the calculations.
2.50 g C4H10 ( 1 mol C4H10 / 58.14 g C4H10) ( 4 mol CO2 / 1 mol C4H10 ) = 0.21 mol CO2
V = nRT / P = 0.21 mol CO2 (0.08206 atm L/mol K) 320.15 K / 1.04 atm = 5.30 L CO2
5 mols of O_2 need 4 mol NH_3
- As mols of ammonia are less Ammonia is limiting reagent
Now
Moles of Ammonia
- Given mass/Molar mass
- 4.65/17
- 0.3mol
Moles of NO=0.3mol
Mass of NO
So
Moles of Oxygen
Remaining moles
Mass
Yield
Carbon atom has two isotopes
relative abundance of one isotope = 98.89% = 98.89 / 100 = 0.9889
As this isotopes have 6 neutrons and 6 protons, and there sum is equal to the mass of that isotope = 6 + 6 = 12amu
And other isotope have relative abundance = 1.11% = 1.11/100 = 0.0111
And mass of that isotope = 7 neutrons + 6 protons = 13amu
Now, average atomic mass of carbon = (0.9889 x 12) + (0.0111 x 13) =11.8668 + 0.1443 = 12.0111 = 12.0 = 12