Answer:
4.
Explanation:
They are:
Each of the digits of a number that are used to express it to the required degree of accuracy, starting from the first nonzero digit:
qjq-gcww-egh come this
acid base
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780.354g
22.99(3)+30.97+16(4)
=163.94g/mol
163.94*4.76=780.354g...