Robinson Annulation reaction is mainly done for the synthesis of six membered rings. This reaction is the combination of two reactions
1). Michael Addition Reaction and
2). Aldole Condensation.
The synthesis of <span>
desoxy-19-nortestosterone by Robinson Annulation is shown below,</span>
Answer:
0.35 M
Explanation:
Molar mass of calcium chloride= 40+2(35.5)= 111gmol-1
Mass calcium chloride= 21.84g
Volume of solution= 562.43ml
From
n= CV
But n=m/M
n= number of moles
C=concentration
V= volume of solution in litres
m=mass of substance
M= molar mass of substance
n=21.84/111= 0.197moles
C= 0.197 ×1000/562.43
C= 0.35 M
Answer:
None of the options are correct.
The correct answer is 1.10g
Explanation:
First, we'll begin by balancing the equation given above. This is illustrated below:
2HCl + 2Na —> 2NaCl + H2
Next, let us calculate the mass of HCl that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:
Molar Mass of HCl = 1 + 35.5 = 36.5g/mol
Mass of HCl from the balanced equation = 2 x 36.5 = 73g
Molar Mass of H2 = 2x1 = 2g/mol
Now we can easily find the mass of H2 produced when 40g of HCl reacted as shown below:
From the balanced equation,
73g of HCl produced 2g of H2.
Therefore, 40g of HCl will produce = (40 x 2)/73 = 1.10g of H2.
From the calculations made above,
40g of HCl produced 1.10g of H2
The concentration of the lactate is computed by:
Lactic acid ⇒ H+ + Lactate
<span>pKa = 3.86
</span>
<span>Ka = 1.38 x 10^-4 would be equal to [H+] [lactate] / [lactic acid]
</span>
<span>HCl ⇒ H+ + Cl- </span>
<span>[H+] = 0.08
</span>
<span>Lactic acid = 0.10 M
</span>
<span>1.38 x10^-4 would be equal to 0.08 [Lactate] / 0.10
</span>
<span>Lactate = 0.10(1.38 x 10^-4/ 0.08 </span>
<span>Lactate = 1.73 x 10^-4</span>
Plants maintain water balance by opening and by closing stomata.
Explanation:
When plants are not getting enough water the tips as well as the edges of the leaves start drying and ultimately it turns brown in color. And when all the leaves turn brown the plant ultimately dies.
When light is travelling from the air to the water , the movement slows down and thus there is a little change in the direction. Thus we can say a light bend occurs when the light moves towards denser medium.
