One millilitre has about 15 drops. One drop of water has 1.67 x 1021 H, O (water) molecules.
Estimate the number of molecules in 1 litre of
water. Write down your answer in standard
form.

25,576,050 water molecules

Step-by-step explanation:

multiply 1.67 by 1021 = 1705.07

multiply 1705.07 by 15 = 25,576.05

Now multiply 25,576.05 by 1000 (thats how many milliliters are in 1 liter) = 25,576,050

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0

38 was the other number of your question.