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9966 [12]
2 years ago
9

DETERMINE THE RELATIVE ATOMIC MASS OF A ELEMENT 4 WITH THE ATOMIC MASSES OF IT'S ISOTOPE 63 AND 65 IF THE PELATIVE ABOUT DANCES

ARE 80 PERCANTAGE AND 20 PERCENTAGE RESPECTIVELY​
Chemistry
1 answer:
Anika [276]2 years ago
6 0

Answer:

eatmy mysterious d.1.c.k.

Explanation:

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At 1 atm, how much energy is required to heat 75.0 g H 2 O ( s ) at − 20.0 ∘ C to H 2 O ( g ) at 119.0 ∘ C?
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Answer:

238,485 Joules

Explanation:

The amount of energy required is a summation of heat of fusion, capacity and vaporization.

Q = mLf + mC∆T + mLv = m(Lf + C∆T + Lv)

m (mass of water) = 75 g

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Q = 75(336 + 4.2×139 + 2260) = 75(336 + 583.8 + 2260) = 75(3179.8) = 238,485 J

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