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3 years ago

How much energy is required to raise the temperature of 3 kg of iron from 20°

Chemistry

1 answer:

Vinvika [58]3 years ago

8 0

Answer:

Option C (6750 J) is the appropriate response.

Explanation:

The given values are:

Mass of iron,

m = 3 kg

Specific heat capacity,

$c_A$ = 0.450

Temperature,

T = $25-20$

= $5^{\circ}C$

Now,

⇒ $Q=mc_A T$

On substituting the values, we get

⇒ $=3\times 0.450\times 5$

⇒ $=6.75$

i.e,

⇒ $=6750 \ J$

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3 years ago

A particular reactant decomposes with a half‑life of 109 s when its initial concentration is 0.280 M. The same reactant decompos

Sophie [7]

Answer:

The order of reaction is 2.

Rate constant is 0.0328 (M s)⁻¹

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The rate of a reaction is inversely proportional to the time taken for the reaction.

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a) For zero order reaction: the half life is directly proportional to initial concentration of reactant

b) for first order reaction: the half life is independent of the initial concentration.

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Rate = $\frac{1}{k[A_{0}]^{(n-1)}}$

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$\frac{(halflife_{1})}{(halflife_{2})}=\frac{[A_{2}]^{(n-1)}}{[A_{1}]^{(n-1)} }$

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$\frac{109}{231}=\frac{[0.132]^{(n-1)}}{[0.280]^{(n-1)}}$

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