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Alborosie
4 years ago
6

How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP

?
Chemistry
1 answer:
ludmilkaskok [199]4 years ago
7 0
The reaction of magnesium and hydrochloric acid is a single displacement reaction. The reaction is expressed as Mg + 2HCl= MgCl2 + H2. There is a one is to one correspondence of Mg and H2. Hence there is also 0.02 mol of H2. Using PV=nRT where T is 273 K, P is 1 atm and R is 0.0821 L atm/mol K, volume is equal to 0.4483 L or 448.3 mL.
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Which statement describes how chemical formula such as H20 represent compounds check all that apply
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<h3>Answer:</h3>
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8 0
3 years ago
Under what pressure did 10L of gas change to if the original pressure was 4 atm on 3L?​
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How many moles of LiOH are required to make 4.2 liters of a 0.98 M
ASHA 777 [7]

Answer:

4.12 mol  

Explanation:

Given data:

Moles of LiOH  required = ?

Volume of solution = 4.2 L

Molarity of solution = 0.98 M

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Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

we will calculate the moles from above given formula.

0.98 M = number of moles / 4.2 L

0.98 M × 4.2 L = number of moles

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7 0
4 years ago
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