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EastWind [94]
2 years ago
9

Gold is a natural resource, because it occurs naturally in the environment and humans use it. Gold cannot be made from other sub

stances, and there is a finite supply of it.
What is gold an example of?

A. a fossil fuel
B. a renewable resource
C. a nonrenewable resource
D. a natural pollut
Chemistry
2 answers:
Viktor [21]2 years ago
5 0

Answer:

Answer below:

Explanation:

A nonrenewable resource

Debora [2.8K]2 years ago
5 0
C. It is a natural resource that is used in the environment.
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A chemist adds of a M zinc nitrate solution to a reaction flask. Calculate the mass in grams of zinc nitrate the chemist has add
weqwewe [10]

corrected question: A chemist adds 135mL of a 0.21M zinc nitrate solution to a reaction flask. Calculate the mass in grams of zinc nitrate the chemist has added to the flask. Round your answer to significant digits.

Answer:

5.37g

Explanation:

0.21M means ; 0.21mol/dm³

1dm³=1L , so we can say 0.21mol/L

if 0.21mol of Zinc nitrate is contained in 1L of water

x   will be contained in 135mL of water

x= 0.21*135*10³/1

=0.02835moles

number of moles=  mass/ molar mass

mass= number of moles *molar mas

molar mass of Zn(NO₃)₂=189.36 g/mol

mass= 0.02835 *189.36

mass=5.37g

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