Question

One millilitre has about 15 drops. One drop of

water has 1.67 x 10^21 H₂O (water) molecules.
Estimate the number of molecules in 1 litre of
water. Write down your answer in standard
form.

Answer 1

25,576,050 water molecules

Explanation:

multiply 1.67 by 1021 = 1705.07

multiply 1705.07 by 15 = 25,576.05

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

hopefully this makes sense <3