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Tarnishing of silver is caused by hydrogen sulfide and other sulfur containing compounds in the air reacting to the silver and resulting in a fine layer of silver sulfide. The other answers don't make sense
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Answer: The new concentration of the solution is 0.143 M.
Explanation:
Given:
= 300.0 mL,
= 0.335 M
= 700.0 mL,
= ?
Formula used is as follows.

Substitute values into the above formula as follows.

Thus, we can conclude that the new concentration of the solution is 0.143 M.