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Zanzabum
3 years ago
14

Brainliest.....If you give me a random answer you will be reported.... Also you will lose any chance to obtain a brainlest from

me in the future
When an ammonium ion reacts with water, water acts as a Brønsted-Lowry base. Choose the reaction that describes this.

A. NH4+(aq) + H2O(l) ⇌ OH−(aq) + NH52+(aq)

B. NH4(aq) + H3O+(aq) ⇌ H2O(l) + NH52+(aq)

C. NH3(aq) + H2O(l) ⇌ H3O+(aq) + NH2−(aq)

D. NH4+(aq) + H2O(l) ⇌ H3O+(aq) + NH3(aq)
Chemistry
1 answer:
Georgia [21]3 years ago
8 0

Answer:

im pretty sure its b

Explanation:

im sorry if im wrong i tried my best

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Ethanol (c2h5oh) melts at -114°c. the enthalpy of fusion is 5.02 kj/mol. the specific heats of solid and liquid ethanol are 0.9
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Answer: 4.18925 kJ heat is needed to convert 25.0 g of solid ethanol at -135 °C to liquid ethanol at -50°C.

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Temperature of Solid C_2H_5OH=-135^oC=138 K(0^oC=273K)

Melting temperature of Solid C_2H_5OH=114^oC=159 K

Temperature of liquid C_2H_5OH=-50^oC=223K

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Heat required to melt the the 25 g solid C_2H_5OH at 159 K

\Delta T_1 = 159 K - 138 K = 21 K

Q_1=mc\Delta T= 25\times 0.97J/gK\times 21 K=509.25 J

Heat required to melt and raise the temperature of C_2H_5OH upto 223 K

\Delta T_2 = 223 K - 159 K  = 64 K

Q_2=mc\Delta T= 25\times 2.3J/gK\times 64 K=3680 J

Total heat to convert solid ethanol to liquid ethanol at given temperature :

Q_1+Q_2=509.25 J+3680 J=4189.25 J=4.18925 kJ (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.

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