Answer:
0.205M
Explanation:
Molarity is an unit of concentration used in chemistry defined as the ratio between moles of solute (In this case, LiF) and liters of solution.
To solve this question, we must find the moles of LiF and the liters of the solution:
<em>Moles LiF -Molar mass: 25.939g/mol-:</em>
2.39g * (1mol / 25.939g) = 0.0921moles
<em>Liters solution:</em>
450mL * (1L / 1000mL) = 0.450L
Molarity is:
0.0921 moles / 0.450L =
<h3>0.205M</h3>
A temperature change in a reaction indicates a chemical change
Explanation:
The sum of all oxidation numbers in a neutral compound is zero. The sum of all oxidation numbers in a polyatomic (many-atom) ion is equal to the charge on the ion. The oxidation number of oxygen in a compound is usually –2. The oxidation state of hydrogen in a compound is usually +1.
The oxidation state of Al in Al(OH)
4
−
x+4(+1−2)=−1
∴x=+3
The oxidation state of Mn in MnO
2
y+2(−2)=0
∴y=+4
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