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V125BC [204]
3 years ago
14

Date a rock using half life

Chemistry
1 answer:
Finger [1]3 years ago
5 0
I don’t know your exact question but it’s half life is the number of years of an element to get half of itself not be usable or available anymore.
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262mol 1=kg
g=1000
from stoichoimetry

x=102*1000/360
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x=283.33

density =m/v
=283.33/1.082
=262mol

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Which technique reveals latent fingerprints on wooden furniture?
love history [14]

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3 years ago
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The chemical equation below shows the formation of aluminum oxide (Al2O3) from aluminum (Al) and oxygen (O2). 4Al 3O2 Right arro
Andrew [12]

Formation reaction is the formation of 1 mole of product from the constituents of the reactant molecules. The mass of oxygen that must react is 182 gm.

<h3>What is mass and molar mass?</h3>

Mass of the substance is the weight while the molar mass of the substance is the addition of the atomic mass of the individual mass of the constituent atoms of the compound or the molecule.

The chemical reaction can be shown as:

\rm 4 Al + 3 O_{2} \rightarrow 2 Al_{2}O_{3}

From the reaction, it can be said that 3 moles of oxygen are required to produce 2 moles of aluminium oxide, so x moles of oxygen will be required to produce 3.80 moles of aluminium oxide.

Solving for x:

\begin{aligned}\rm 2x &= 3.80\times 3\\\\\rm x &= \dfrac{11.4}{2}\\\\&= 5.7\;\rm mol\end{aligned}

If 1 mol of oxygen is 32 gm then 5.7 moles of oxygen will be 182.4 gm.

Therefore, option D. 182 gm is the mass of oxygen required.

Learn more about moles and molar mass here:

brainly.com/question/893495

3 0
2 years ago
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