Answer: yes I can do that tomorrow
Explanation:
Divide by 1000
145÷1000=0.145
Hope this will be helpful.
Answer
The components of the r group of amino acid structure varies among different amino acids
Explanation
As the functional group for amino acids is as:
R-CH-COOH
I
NH2
only R differs so amino acids also differs. If R is “H” then amino acid is glycine and if R is “CH3” then amino acid is alanine. Hence, R is different for different amino acids. Other components as alpha carbon ( C ), carboxyl group ( COOH ) and amino group ( NH2 ) is fixed for every amino acid.
Answer: 4.18925 kJ heat is needed to convert 25.0 g of solid ethanol at -135 °C to liquid ethanol at -50°C.
Explanation:
Temperature of Solid
Melting temperature of Solid ![C_2H_5OH=114^oC=159 K](https://tex.z-dn.net/?f=C_2H_5OH%3D114%5EoC%3D159%20K)
Temperature of liquid ![C_2H_5OH=-50^oC=223K](https://tex.z-dn.net/?f=C_2H_5OH%3D-50%5EoC%3D223K)
Specific heats of solid ethanol = 0.97 J/gK
Specific heats of liquid ethanol = 2.3 J/gK
Heat required to melt the the 25 g solid
at 159 K
= 159 K - 138 K = 21 K
![Q_1=mc\Delta T= 25\times 0.97J/gK\times 21 K=509.25 J](https://tex.z-dn.net/?f=Q_1%3Dmc%5CDelta%20T%3D%2025%5Ctimes%200.97J%2FgK%5Ctimes%2021%20K%3D509.25%20J)
Heat required to melt and raise the temperature of
upto 223 K
= 223 K - 159 K = 64 K
![Q_2=mc\Delta T= 25\times 2.3J/gK\times 64 K=3680 J](https://tex.z-dn.net/?f=Q_2%3Dmc%5CDelta%20T%3D%2025%5Ctimes%202.3J%2FgK%5Ctimes%2064%20K%3D3680%20J)
Total heat to convert solid ethanol to liquid ethanol at given temperature :
(1kJ=1000J)
Hence, 4.18925 kJ of heat will be required to convert 25.0 g of solid ethanol at -135 °C to liquid ethanol at -50°C.