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Using ideal gas law–
We'll use formula,
PV = nRT
Where,
P, Pressure = 1.40 atm
V, Volume = 42.4 L
n, Number of moles = ( To find ) ?
T, temperature = 25°C
R, Ideal gas constant = 0.08206 L . atm/k. Mol
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Here, PV = nRT
Or, PV / RT = n
Or, 
Or, n = 2.43 Moles.
Or, n = 2.43 Moles.
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I had to take help from my elder brother.
We tried our best, hope it helps you.
By– Debasis ( feat – Apollo)
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The moles of hydrogen which are produced from 57.5 grams of lithium is 8.21 grams.
<h3>What is stoichiometry?</h3>
Stoichiometry of the reaction gives idea about the relative amount of product produced by the reactant in terms of moles.
Given chemical reaction is:
2Li(s) + H₂O(l) → 2LiOH(aq) + H₂(g)
Moles of lithium will be calculated as:
n = W/M, where
- W = given mass = 57.5g
- M = molar mass = 7g/mol
n = 57.5 / 7 = 8.21 mol
From the stoichiometry of the reaction:
- 2 moles of Li = produces 1 mole of H₂
- 8.21 moles of Li = produces 8.21/2=4.105 moles of H₂
Mass of H₂ = (4.105mol)(2g/mol) = 8.21g
Hence required mass of hydrogen gas is 8.21g.
To know more about mass & moles, visit the below link:
brainly.com/question/20563088
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Answer:
C7H6O+8O2 ---> 7CO2+3H2O
Explanation:
number of atoms of each element must be equal in both sides
Answer:
Physical change
Explanation:
A physical change is one in which no new substance is formed and can be reversed using physical methods.
When we mix the salt and water, we have merely carried out a physical change. No new substance was formed. To recover the salt, we simply heat the solution to dryness.
Hence, this is an example of a physical change.
