Question 1119018
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comment from tutor @greenestamps....<br>
Rounded to 2 decimal places, as asked for in the question, the answer is 6.48 grams.<br>
Do you have a resource telling you that is not the answer?  If so, then that resource is wrong.  Ignoring the requirement for the number of decimal places in the answers, the answers you got from all three of the different tutors here are all correct answers.