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Alex_Xolod [135]
3 years ago
11

A radioactive sample has a half-life of 5 hours. What fraction of the sample will be left after 15 hours?​

Chemistry
1 answer:
DedPeter [7]3 years ago
6 0

Explanation:

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815 cal of heat is added to 5.00 g ice at –20.0 °C. What is the final temperature of the water?
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The amount of heat needed to raise the temperature of an object is obtained through the equation,
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3 years ago
**PLEASE SHOW YOUR WORK**Calculate how much energy would be necessary to convert 250.0 grams of ice at -30°C to steam at 145°C.
garri49 [273]

Answer:

Q= mc∆T(ice) + mLF(ice) + mc∆T(water) + mLV(water) + mc∆T(steam)

m=250 g = 0.25 kg = ¼ kg c(ice)= 2100 J/kg.K c(water)= 4200 J/kg.K LF(ice)= 333.7 kJ/kg LV(water)= 2256 kJ/kg c(steam)= 2080 J/kg.K

Explanation:

Q= ¼ × 2100 × (0°-(-30°)) + ¼ × 333700 + ¼ × 4200 × (100°-0°) + ¼ × 2256000 + ¼ × 2080 × (145°-100°)

Q= 15750 + 83425 + 105000 + 564000 + 23400

Q= 791575 J

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