Final answer:
To find the total weight, add the weight of the watch glass (5.881 g) to the weight of the aspirin sample (0.553 g) converted from milligrams to grams, resulting in a combined weight of 6.434 grams.
Step-by-step explanation:
To calculate the combined weight of the watch glass and the sample of aspirin, you simply need to add the weight of the watch glass to the weight of the aspirin sample. The weight of the watch glass is 5.881 grams, and the weight of the aspirin sample is 553 milligrams, which needs to be converted to grams by dividing by 1000, giving us 0.553 grams for the aspirin. Therefore, the calculation is as follows:
5.881 g (watch glass) + 0.553 g (aspirin) = 6.434 grams
So, the combined weight of the watch glass and the aspirin sample is 6.434 grams.