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Answer: The density of the object will be g/ml.
Explanation:
Density is defined as the mass contained per unit volume.
Given : Mass of object = 7.95 grams
Volume of water displaced = volume of the object = (95.2 - 15.5) ml =79.7 ml
Putting in the values we get:
Thus density of the object will be g/ml
Answer:
Approximately .
Explanation:
Lookup Avogadro's Number: (three significant figures.)
Lookup the relative atomic mass of ,
, and
on a modern periodic table:
:
.
:
.
:
.
(For example, the relative atomic mass of is
means that the mass of one mole of
atoms would be approximately
grams on average.)
The question counted the number of molecules without using any unit. Avogadro's Number
helps convert the unit of that count to moles.
Each mole of molecules includes exactly
of these
molecules.
molecules would correspond to
of such molecules.
(Keep more significant figures than required during intermediary steps.)
The formula mass of gives the mass of each mole of
molecules. The value of the formula mass could be calculated using the relative atomic mass of each element:
.
Calculate the mass of approximately of
:
.
(Rounded to three significant figures.)