The molar heat capacity is the heat capacity per unit amount (SI unit: mole) of a pure substance and the specific heat capacity, often called simply specific heat, is the heat capacity per unit mass of a material.
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Answer:
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Explanation:
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.
Bonds payable to whomever holds them are called bearer bonds or unregistered bonds.
<h3>What is bearer bond ?</h3>
Bonds that have no registered owners are known as bearer bonds. Instead, the bond is owned by whoever "bears" (or has possession of) it. Bearer bonds, sometimes known as coupons, have coupons that bondholders can detach and present to receive interest payments.
<h3>What are interest payments ?</h3>
An interest rate is the amount of interest that is payable each period stated as a percentage of the amount that was lent, deposited, or borrowed. The principal amount, interest rate, frequency of compounding, and duration of the loan, deposit, or borrowing determine the total amount of interest on a sum that was lent or borrowed.
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