davienwatson8

davienwatson8

27.05.2021 •

Chemistry

Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen. In
another investigation, a student reacted 20cm
of hydrochloric acid with a concentration of
1.5 mol dm-3 with excess magnesium.
1) Write a balanced chemical equation for the
reaction.
11) Calculate the number of moles of hydrochloric
acid used.
111) Determine the number of moles of magnesium
chloride produced.
iv) Calculate the mass of magnesium chloride
produced.

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Ответ:

famouzgal

24.10.2022

The time required to reach the center line temperature of 800 K is t = 58 sec

Explanation:

Given data

D = 0.1 m

h = 100 $\frac{W}{m^{2}K }$

Specific heat for carbon steel (C) = 502.4 $\frac{J}{Kg K}$

Furnace temperature T_ o = 1200 K

Final temperature T = 800 K

Initial temperature T_i = 300 K

From lumped heat analysis

$\frac{T - T_o}{T_i -T_o} = e^({- \frac{6h}{\rho C D} } } ) t$ ------- (1)

$\frac{6h}{\rho CD} = \frac{(6)(100)}{(7850)(540)(0.1)}$

$\frac{6h}{\rho CD} = 0.001415$

Now from equation (1)

$\frac{800-1200}{300-1200} = e^{-0.001415t}$

㏑ 0.44 = -(0.001415 ) t

-(0.001415 ) t = - 0.82

t = 58 sec

Thus the time required to reach the center line temperature of 800 K is

t = 58 sec

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