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2 years ago

9

PLEASE HELP WILL GIVE BRAINLEIST ASAP Determine the fraction of an original sample of K-42 that remains unchanged after 24.72 ho

urs.

1 answer:

Alinara [238K]2 years ago

8 0

Answer:

25% or 0.25 or 1/4

Explanation:

don't know which form you need so here you have all 3

good luck :)

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2NH4ClO4 --------> N2 + Cl2 + 2O2 + 4H2O
from reaction 2 mol 1 mol
given x mol 0.10 mol

Proportion:
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x mol NH4ClO4 0.10 mol Cl2

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3 years ago

What is the temperature difference if 300 cal are used to warm water

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Answer:

<u>The temperature difference is</u> $\frac{300}{m} Kkg^{-1}$

Explanation:

The formula that is to used is :

Δ $Q=ms$ Δ $T$

<em>where ,</em>

<em>Δ $Q$ is the heat supplied in calories = 300cal</em>
<em> $m$ is the mass of water taken = m (assumed)</em>
<em>Δ $T$ is the change in temperature</em>
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3 years ago

Which best demonstrates an example of the common ion effect?

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Answer: A. The compound CuCl is 500 times less soluble in sea water than it is in pure water.

pure water.

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.

This principle states that if there is any change in a equilibrium reaction, the equilibrium will shift in a direction so as to minimize the effect.

Thus when a common ion is introduced to an equilibrium reaction, the equilibrium will shift in a direction where the concentration of common ion is decreasing.

$CuCl\rightleftharpoons Cu^++Cl^-$

$NaCl\rightarrow Na^++Cl^-$

When common ion such as $Cl^-$ from NaCl in sea water is introduced to an equilibrium reaction, the equilibrium will shift in a direction where the concentration of common ion is decreasing i.e. in the left side and thus solubility of CuCl further decreases.

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3 years ago

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Water cause more erosion over time

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