Answer:
1/8
Explanation:
From;
Nt/No = (1/2)^t/t1/2
N= amount of dimethylether present at time t
No= amount of diethylether present at time t=0
t= time taken for N molecules of diethylether to remain = 4710 seconds
t1/2 = half-life of diethylether = 1570 seconds
Substituting values;
Nt/No = (1/2)^4710/1570
Nt/No = (1/2)^3
Nt/No= 1/8
Hence after 4710 seconds only 1/8 molecules of dimethylether will remain
Answer:
Theoretical yield is 10.0g of HF.
Explanation:
Theoretical yield is defined as the yield of a reaction assuming a 100%.
In the reaction:
SiF₄(s) + 2H₂O(l) → 4HF(aq) + SiO₂(s)
2 moles of water produce 4 moles of HF.
4.51g of H₂O are:
4.51g ₓ (1mol/18.02g) = 0.250moles of water. Moles of HF:
0.250moles H₂O ₓ (4mol HF/2mol H₂O) = 0.500mol HF
In grams:
0.500mol HF ₓ (20.01g / 1mol) = <em>10.0g of HF - theoretical yield-</em>
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I hope it helps!
Answer:
B. decay of dead marine organisms
Explanation:
When the temperature is low, carbon dioxide is captured by the oceans, and when the temperature is high, it is released by the oceans into the atmosphere. At sea, carbon dioxide feeds phytoplankton.
Most of the carbon dioxide consumed by plant plankton (phytoplankton) returns to the atmosphere when this phytoplankton dies or is consumed, but a portion is deposited in the ocean floor sediments when these small particles sink. This process is called a "biological bomb" because carbon dioxide is transported from the atmosphere to the ocean floor.
Explanation:
13. 8,448 = 8,450 (round up, 8 more than 5)
14. 89.32 = 89.3 (round down, 2 less than 5, 0 is not needed)
15. 0.05678 = 0.0568 (round up, 8 more than 5, 0 in front are not significant)