4 is correct for this one
Answer:
Explanation:
Well you didn’t send a picture of the question but h2O is water so. If the questions answer has a option of water then pick that one
I believe the correct answer from the choices listed above is the second option. The expression (6.0 x 104) (3.1 x 10-1) is equal to 1.9 x 10^4. We only have two significant figures from the starting expression that is why we rounded of the product from 1.86 to 1.9.