I need help with a chemistry problem. Can someone help me with the steps to get to the final answer? Thanks

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I need help with a chemistry problem. Can someone help me with the steps to get to the final answer? Thanks

[From: ] [author: ] [Date: 11-10-02] [Hit: ]

09 g and the post-1982 pennies weigh 2.51 g, how many of the pennies are pre-1982?3.09 O + 2.51 N = 3501.......

A student weighs 1254 pennies and finds them to have a mass of 3501.4 g. If the pre-1982 pennies weigh on average 3.09 g and the post-1982 pennies weigh 2.51 g, how many of the pennies are pre-1982?

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N = number of new pennies
O = number of old ones
N + O = 1254
3.09 O + 2.51 N = 3501.4
Solve by substitution

1

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