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yawa3891 [41]
3 years ago
5

Need help quick! 10 points for correct answer :)

Chemistry
2 answers:
ra1l [238]3 years ago
3 0

Answer:

gram to mole conversation

Elina [12.6K]3 years ago
3 0

Answer:

gram to mole conversation

Explanation:

I have taken this quiz

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Using the equations and enthalpy values provided, which mathematical expression can be used to determine the unknown enthalpy ch
vlabodo [156]
In order to solve this, we need to make use of Hess' Law.

We are already given the equations and their corresponding deltaH. Using Hess' Law, we can generate this equation:
104 kJ = x - (-1182 kJ) - (-1144 kJ)

Among the choices, the answer is
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3 years ago
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netineya [11]

Answer:

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Explanation:

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3 years ago
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Based on table N of the reference tables what is the number of hours required for 42k (potassium -42) to undergo three half-life
skelet666 [1.2K]

The number of hours required : 37.2 hours

<h3>Further explanation</h3>

Given

⁴²K (potassium -42)

Required

The number of hours

Solution

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually, radioactive elements have an unstable atomic nucleus.  

Based on Table N(attached), the half-life for ⁴²K is 12.4 hours, which means half of a sample of ⁴²K will decay in 12.4 hours

For three half-life periods :

\tt 3\times 12.4=37.2~hours

3 0
3 years ago
What existed during the mesozoic era
Ilia_Sergeevich [38]
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Use your calculator to determine the answer to the following calculation:<br> 1.0×10^−15/4.2×10^−7
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