Actually it should be 7.44 since the number 2.13 has only two decimal places.
i got 7.43621 hope it helps
The sum of 0.04321 g + 5.263 g + 2.13 g is 7.43621 g . When rounded to the correct number of significant digits, the final answer is 7.44 g . This is based on the measurement with the least number of decimal places, which is 2 decimal places.
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