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Stella [2.4K]
3 years ago
12

A 5.0-gram sample of zinc and a 50.-milliliter sample of hydrochloric acid are used in a chemical reaction. Which combination of

these samples has the fastest reaction rate?
(1) a zinc strip and 1.0 M HCl(aq)
(2) a zinc strip and 3.0 M HCl(aq)
(3) zinc powder and 1.0 M HCl(aq)
(4) zinc powder and 3.0 M HCl(aq)
Chemistry
2 answers:
Radda [10]3 years ago
7 0
The answer is Zine powder and 3.0 M HCl (aq)
inessss [21]3 years ago
5 0

Answer:

(4) zinc powder and 3.0 M HCl(aq)

Explanation:

First consider the equation of reaction:

Zn + 2HCl --> ZnCl_2 + H_2

1 mole of Zinc requires 2 moles of HCl for reaction.

mole of zinc = mass/molar mass = 5.0/65.38 = 0.0765 mole

0.0765 mole of zinc will require: 0.0765 x 2 = 0.1530 mole HCl

Mole of 1.0 M HCl = Molarity x volume = 1 x 0.05 = 0.05 mole

Mole of 3.0 M HCl = 3 x 0.05 = 0.15

Hence, the 3.0 M HCl is what will give the required number of mole.

<em>Zinc in powder form will react faster compared to in strip because the former has higher surface area for reaction.</em>

Therefore, zinc powder and 3.0 M HCl will give the fastest reaction rate.

<em>The correct option is option 4.</em>

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Putting values in above equation, we get:

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