Answer:
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Explanation:
Apply rubbing alcohol, hairspray, or hand sanitizer to dilute the stain, making it easier to remove during the wash. These solvents help tackle most types of ink stains, but remember to test the stained garment for colorfastness first, as they can also attack fabric dyes and cause further damage.
Given that
Mass of water = 65.34 g
Amount of heat = mass of water * specific heat (temperature change
)
= 65.34 g * 4.184 J / g-C ( 21.75-18.43 )C
= 907.63 J
= 0.908 KJ
And
1 cal = 4.186798 J
907.63 J * 1 cal / 4.186798 J =216.78 cal
Or0.218 kcal
MgF₂ has one magnesium ion and two fluoride ions per unit of magnesium fluoride. The percent mass of elements of MgF2 are 39.012 of Mg and 60.989 of F.
- Magnesium fluoride is a binary ionic compound. It is comprised of two fluorine and one magnesium atom. Since it is an ionic compound, it is made up of anions and cations.
- Magnesium is metal and has a much lower electronegativity than fluorine. Hence, this compound consists of two fluoride anions and a magnesium cation.
- Mass percent of an element in a compound ⇒
( mass of the elements/ molar mass of compound) × 100
Molar mass of MgF₂, is 62.301g/mol (24.305+2×18.998)
Mass Percent of Mg =( 24.305 / 62.301) × 100
= 39.012%
Mass percent of F = (18.998×2 / 62.301) ×100
= 60.989%
Thus we can conclude as :
Element Atomic Number of Atoms Mass Percent.
mass
Mg 24.305 1 39.012%
F 18.998 2 60.989%
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