Answer:
A. 68°F
B. 293K
Explanation:
The temperature (celsius) = 20.0°C
A. Conversion of the temperature in celsius to fahrenheit.
This is illustrated below:
°F = 9C/5 + 32
C = 20°C
°F = 9C/5 + 32
°F = 9x20/5 + 32
°F = 36 + 32
°F = 68°F
B. Temperature (Kelvin) = temperature (celsius) + 273
Temperature (celsius) = 20°C
Temperature (Kelvin) = 20°C + 273
Temperature (Kelvin) = 293K
Ice is constantly subliming to form a layer of water vapor
Answer:
Substrate:alkyl halide
Leaving group: Cl
Organic product: The nitrile
Inorganic product: Cl-
Nucleophile: CN-
Explanation:
An SN2 reaction is a concerted bimolecular reaction. Concerted means that it involves two reactions taking place at the same time while bimolecular means that the rate determining step involves two molecules. The cyanide ion attacks the alkyl halide from the rear. In the transition state, the leaving group (Cl-) is departing while the nucleophile (CN-) is forming a bond to the alkyl halide simultaneously. The alkyl halide is the substrate in the reaction. The organic product is the nitrile shown in the image attached.
Answer:
D. -120.9 kJ
Explanation:
According to Hess's law ,the total enthalpy change for a reaction is the sum of all changes regardless of the stages or the steps of the reaction.
....(1)
(this reaction should be reversed in order to reach the required reaction )
On reversing the reaction the sign of 
get reversed.
(In this case change sign from '-' to'+'. Hence = + 65 kJ)
....(1)
......(2)
Adding equation (1) and (2)
![Ca(OH)_{2} + 2HCl \rightarrow CaCl_{2} + 2H_{2}O[tex][tex]Delta H = - 186 + 65 = - 121\kJ](https://tex.z-dn.net/?f=%3Cstrong%3ECa%28OH%29_%7B2%7D%20%2B%202HCl%20%5Crightarrow%20CaCl_%7B2%7D%20%2B%202H_%7B2%7DO%3C%2Fstrong%3E%5Btex%5D%3C%2Fp%3E%3Cp%3E%5Btex%5D%3Cstrong%3EDelta%20H%20%3D%20-%20186%20%2B%2065%20%3D%20-%20121%5CkJ%3C%2Fstrong%3E)
(It is nearly equal to -120.9 kJ)
