7g is slightly more than 698mg
However, the way in which the two quantities are presented in the question, 7g could refer to any amount from 6.5 to 7.5 grams rounded to the nearest gram, whereas 698 mg would range from 697.5 to 698.5 mg, rounded to the nearest mg. It is, therefore possible that 7 g is up to 48.5 mg less massive.
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