If a leaf and a dime are dropped from the same height, what force will cause the leaf to fall more slowly?
1 answer:
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Answer: Option (a) is correct.
Explanation:
Molecules of sugar given =
According to Avogadro's number it is known that 1 mole contains .
Therefore, calculate the moles of sugar present in the sample as follows.
Number of moles =
= 0.25 mol
Thus, the moles of sugar present in the sample is 0.25 mol.
Answer : The activation energy for the reaction is, 52.9 kJ/mol
Explanation :
According to the Arrhenius equation,
or,
where,
= initial temperature =
= final temperature =
= rate constant at
=
= rate constant at
=
= activation energy for the reaction = ?
R = gas constant = 8.314 J/mole.K
Now put all the given values in this formula, we get:
Therefore, the activation energy for the reaction is, 52.9 kJ/mol
Answer:
1.38 x atoms
Explanation:
To get grams to atoms/molecules/particles we need to first convert grams > moles > atoms. This also applies in the other direction, where you have moles as that stepping stone.
Some key information we need:
Magnesium's molar mass= 24g/mol
Avogadro's Number= 6.022 x atoms
Where there is 1 mol per 6.022 x atoms
*This maybe be something you want to memorize.
Grams to moles using molar mass , then to atoms using avogadro's number.
55g Mg x x
= 1.38 x
atoms