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kvv77 [185]
2 years ago
6

A first order reaction has a rate constant of 0.543 at 25 c and 6.47 at 47

Chemistry
1 answer:
alukav5142 [94]2 years ago
5 0

The activation energy Ea can be related to rate constant (k) at temperature (T) through the equation:

ln(k2/k1) = Ea/R[1/T1 - 1/T2]

where :

k1 is the rate constant at temperature T1

k2 is the rate constant at temperature T2

R = gas constant = 8.314 J/K-mol

Given data:

k1 = 0.543 s-1; T1 = 25 C = 25+273 = 298 K

k2 = 6.47 s-1; T = 47 C = 47+273 = 320 K

ln(6.47/0.543) = Ea/8.314 [1/298 - 1/320]

2.478 = 2.774 *10^-5 Ea

Ea = 0.8934*10^5 J = 89.3 kJ

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Explanation:

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KIM [24]
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2 years ago
ch sulfide (ZnS) occurs in the zinc blende crystal structure, (a) If 254 g of ZnS contains 170 g of Zn, what is the mass ratio o
Aleonysh [2.5K]

Answer:

The mass ratio of zinc to sulfide is 85:42.

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Explanation:

a) Mass of zinc sulfide = 254 g

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Mass of sulfide in zinc sulfide sample = x

254 g = 170 g+ x

x = 84 g

The mass ratio of zinc to sulfide:

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In which group of teh modern periodic table are there very reactive metals and very reactive non metals?​
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Metals :-

Group 1A - Alkali metals ( highly reactive metals)

Non-metals :-

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