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21.02.2020 •
Chemistry
A piece of glass is heated to 92.3°C and then placed into a 41.3 g sample of water. The initial temperature of the
water is 18.9°C, and the final temperature of the water is 20.3°C. Calculate the mass of the piece of the glass.
(The specific heat of glass is 0.739 J/g °C.)
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Ответ:
The mass of the piece of glass is 3.47 grams
Explanation:
by comparing the thermal heat of the glass and water we can have mass of glass placed in water.
from the formula,
E=mcp ∅ ( E= change in thermal energy, m= mass, ∅ change in temperature)
by comparing
m1cp1∅1= m2cp2∅2 (mi is mass of water, cp1 specific heat capacity of water,∅2 change in temperature of water)
m2 cp2 and ∅2 is for glass
41.3*4.186*(20.3-18.9)= m2*0.739*92.3
237= m2* 68.2097
m2= 237/68.2097
= 3.47 gram
the mass of the piece of glass is 3.47 grams.
Ответ:
TRUE
Explanation:
Principal shell 2n has one s and one p subshell, and can hold a total of eight electrons. The p subshell has three dumbbell-shaped orbitals, as illustrated in Figure 4.