Ch12_1
New Problems
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Make sure to calculate your answers in SI units unless specified otherwise .
1) A temperature is quoted as
o
F
. What is it in
o
C
(see sheet 3)
?
2) A temperature difference is quoted as
o
C
. What is the temperature difference quoted in
o
K
(see sheet 3)
? Indicate with a positive (negative) sign whether the relation between
D
T
in
o
C
and
o
K
is (not) the same for
D
T
in
o
C
and
o
F
.
3) A substance with a density of
g/cm
3
occupies a volume of
cm
3
. What is the number of Atomic Mass Units
(see sheet 6)
? Indicate with a negative (positive) sign whether the chemical composition of the substance has (does not have) to be known.
4) What is the mass of moles of H
2
O in
kg
(see sheet 6,8')
? Indicate with a negative (positive) sign whether the mass of the same number of hydrogen moles and oxygen moles is (not) the same.
5) How many moles are x10
22
molecules
(see sheet 6)
? Indicate with a negative (positive) sign whether the same number of atoms in a metal (do not) make up the same number of moles.
6) Hydrogen gas at atmospheric pressure and
o
C
occupies a volume of
cm
3
. What is the number of hydrogen atoms in multiples of 10
20
(divide your result by 10
20
)
(see sheets 6,15).
Indicate with a positive (negative) sign whether for helium under the same conditions the number of He atoms would (not) be the same.
Once you have submitted your answers for grading by clicking the grade button, you
cannot resubmit answers
for the same Problem Set--you must use the 'New Problems' button first.