Lithium has one available electron in the outer (valence) shell (2s¹).
1s² 2s¹
Uses Of Periscope
It is used in submarines to determine the distance of a torpedo and helps in deciding the right time for the attack.
It is used in a nuclear reactor to observe the chemical reactions that are taking place.
In military periscopes are used to observe from their hiding position. Hi
They are all equal to one mole (all of the above).
Density is equal to mass/volume
so 61.893/10 = 6.1893
if you need to answer in proper sig fig i think it just becomes 6 since 10 is 1 sig fig
Answer:
(i) 5-day BOD of the waste is 120 mg/l.
(ii) The ultimate carbonaceous BOD (Lo) is 20 mg/l.
Explanation:
The dilution factor D is 0.05.
The initial DO is 8.0 mg/L and the DO after 5 days is 2.0 mg/L.
The BOD of the waste for an unseeded mixture is
![BOD_5=(DO_5-DO_0)/D=(8-2)/0.05=6/0.05=120mg/l](https://tex.z-dn.net/?f=BOD_5%3D%28DO_5-DO_0%29%2FD%3D%288-2%29%2F0.05%3D6%2F0.05%3D120mg%2Fl)
The ultimate carbonaceous BOD (Lo) can be calculated as
![L = L_o*10 ^{- k_1t} \\L_o=L/10^{- k_1t}=2/10^{- 0.2*5}=2/10^{- 1}=2*10=20mg/l](https://tex.z-dn.net/?f=L%20%3D%20L_o%2A10%20%5E%7B-%20k_1t%7D%20%5C%5CL_o%3DL%2F10%5E%7B-%20k_1t%7D%3D2%2F10%5E%7B-%200.2%2A5%7D%3D2%2F10%5E%7B-%201%7D%3D2%2A10%3D20mg%2Fl)