Zero...bcz force which acts on this charge is f=qvB q=2uc ,B=2T and v=o
so,f=zero...
Answer:
3.14 grams of ammonium thiocyanate must be used to react completely with 6.5 g barium hydroxide octahydrate.
Explanation:
![Ba(OH)_2.8H_2O(s)+NH_4SCN(s)\rightarrow Ba(SCN)_2(s)+8H_2O(l)+NH_3(g)](https://tex.z-dn.net/?f=Ba%28OH%29_2.8H_2O%28s%29%2BNH_4SCN%28s%29%5Crightarrow%20Ba%28SCN%29_2%28s%29%2B8H_2O%28l%29%2BNH_3%28g%29)
The balance chemical equation is :
![Ba(OH)_2.8H_2O(s)+2NH_4SCN(s)\rightarrow Ba(SCN)_2(s)+10H_2O(l)+2NH_3(g)](https://tex.z-dn.net/?f=Ba%28OH%29_2.8H_2O%28s%29%2B2NH_4SCN%28s%29%5Crightarrow%20Ba%28SCN%29_2%28s%29%2B10H_2O%28l%29%2B2NH_3%28g%29)
Mass of barium hydroxide octahydrate = 6.5 g
Moles of barium hydroxide octahydrate = ![\frac{6.5 g}{315 g/mol}=0.020635 mol](https://tex.z-dn.net/?f=%5Cfrac%7B6.5%20g%7D%7B315%20g%2Fmol%7D%3D0.020635%20mol)
According to reaction, 2 moles of ammonium thiocyanate reacts with1 mole of barium hydroxide octahydrate. The 0.020635 moles of barium hydroxide octahydrate will react with:
![\frac{2}{1}\times 0.020635 mol=0.04127 mol](https://tex.z-dn.net/?f=%5Cfrac%7B2%7D%7B1%7D%5Ctimes%200.020635%20mol%3D0.04127%20mol)
Mass of 0.04127 moles of ammonium thiocyanate;
![0.04127 mol\times 76 g/mol=3.136 g\approx 3.14 g](https://tex.z-dn.net/?f=0.04127%20mol%5Ctimes%2076%20g%2Fmol%3D3.136%20g%5Capprox%203.14%20g)
3.14 grams of ammonium thiocyanate must be used to react completely with 6.5 g barium hydroxide octahydrate
Answer:
Cone Cell
Explanation:
There are about six to seven million cones in a human eye and are most concentrated towards the macula. Cones are less sensitive to light than the rod cells in the retina (which support vision at low light levels), but allow the perception of color.
Answer:
CuO
Explanation:
As given the molar mass of following Copper Oxide is 79.55 g.mol⁻¹,
CuₐOₓ
Where "a" and "x" are unknown.
As we know the atomic masses of Cu and O are;
Cu = 63.55 g.mol⁻¹
O = 16 g.mol⁻¹
So, it is clear that this oxide is containing only one Copper atom,
So,
Molecular Mass = 79.55
- Copper Mass = 63.55
--------------
16
Hence, 16 g.mol⁻¹ is the mass of one mole of Oxygen atoms, Hence, this oxide contains only one oxygen atom.
Result:
The molecular formula of given copper oxide is CuO.