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AURORKA [14]
2 years ago
9

A first-order reaction has a half-life of 20.0 minutes. Starting with 1.00 x 10^20 molecules

Chemistry
1 answer:
blsea [12.9K]2 years ago
7 0

Answer:

E

Explanation:

100 minutes is   5 half lives  ( 100 min/20 min/half life)

         = (1/2 )^5

1 x 10^20    *    (1/2)^5 =   3.125 x10^18   molecules

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3 0
3 years ago
Label the different components to the atom below. (you should only use each term once)
Darya [45]

Answer:

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Explanation:

3 0
3 years ago
PLEASE ANSWER ASAP ITS TIMED
Andrews [41]

The mole ratio Aluminium to Aluminum Oxide is 2 : 1

<h3>Further explanation</h3>

Given

Reaction

2Al + Fe ----> Al2O3 +2Fe

Required

The mol ratio

Solution

If we look at the reaction above, there is an element missing from the reactant i.e oxygen, because the number of atoms and elements involved in the reaction should be the same between the reactants and products.

So the possible and balanced reactions are:

<em>2Al(s) + Fe₂O₃ (s)  →  Al₂O₃ (s)+ 2Fe (s) </em>

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3 0
3 years ago
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