ewoolbright

01.01.2020 • 

Chemistry

When a 6.50-g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 21.6 degrees c to 37.8 degrees c. calculate delta h (in kj/mol naoh) for the solution process. assume that the specific heat of the solution is the same as that of pure water.

Ответ:

nkidane2802

14.01.2022

Chemistry

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Total mass = 100 + 6.5 = 106.5 g
Specific heat of water = 4.18 Joules/gram °C

Q = mCpΔT
Q = 106.5 x 4.18 x (37.8 - 21.6)
Q = 7177 Joules
Moles of NaOH:
6.5 / (23 + 16 + 1)
= 0.1625

Enthalpy of reaction: 7177/0.1625
= 441.7 kJ/mol NaOH

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Ответ:

Fangflora3

03.02.2021

Chemistry

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ganan electrones debido a que gracias a la regla del octeto alcanzan estabilidad de los gases nobles.

es la C

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