1. A 1 kg mass of radioactive material was left to decay in a laboratory. After 12 years, the remaining mass is already 0.998 Kg. (a) How many kilograms of the material will remain after 900 years? (b) What is the half-life of this material? 2. Coffee with a temperature of 95°C is poured from a pot to a non-insulated cup in a room with a temperature of 20°C. After a minute, the coffee has cooled down to 90°C. How much time is required (from the time it was poured into the cup) before the coffee reaches a drinkable temperature of 65°C?
1. A 1 kg mass of radioactive material was left to decay in a laboratory. After 12 years, the remaining mass is already 0.998 Kg. (a) How many kilograms of the material will remain after 900 years? (b) What is the half-life of this material? 2. Coffee with a temperature of 95°C is poured from a pot to a non-insulated cup in a room with a temperature of 20°C. After a minute, the coffee has cooled down to 90°C. How much time is required (from the time it was poured into the cup) before the coffee reaches a drinkable temperature of 65°C?
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter25: Nuclear Chemistry
Section25.4: Rates Of Nuclear Decay
Problem 25.5CYU
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Transcribed Image Text:1. A 1 kg mass of radioactive material was left to decay in a laboratory. After 12 years, the
remaining mass is already 0.998 Kg. (a) How many kilograms of the material will remain
after 900 years? (b) What is the half-life of this material?
2. Coffee with a temperature of 95°C is poured from a pot to a non-insulated cup in a room
with a temperature of 20°C. After a minute, the coffee has cooled down to 90°C. How
much time is required (from the time it was poured into the cup) before the coffee
reaches a drinkable temperature of 65°C?
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