Final answer:
To calculate the total mass, all measurements were converted to grams, added together, and then rounded to match the precision of the least precise measurement, resulting in a final answer of 7.33 grams.
Step-by-step explanation:
To add 0.0025kg, 1750mg, 2.25g, and 825000micrograms and express the answer in grams, we first need to convert all amounts to the same unit. Let's convert each to grams:
- 0.0025 kg = 2.5 g (since 1 kg = 1000 g)
- 1750 mg = 1.75 g (since 1 mg = 0.001 g)
- 2.25 g is already in grams
- 825000 micrograms = 0.825 g (since 1 microgram = 0.000001 g)
Now, we perform the addition by adding all the values in grams:
The sum is: 2.5 + 1.75 + 2.25 + 0.825 = 7.325 g.
Since the value with the least number of decimal places after the conversion is 2.25 g (two decimal places), we will round our final answer to two decimal places as per the rules of significant figures when dealing with addition:
Final Answer: 7.33 g