Araindrop has a mass of 50 mg and the pacific ocean has a mass of 7.08 x 10^20 kg. use this information to answer the questions below. be sure your answers have the correct number of significant digits.(a) what is the mass of 1 mole of raindrops? round your answer to 2 significant digits.(b) how many moles of raindrops are in the pacific ocean? round your answer to 2 significant digits.

a. 1 mole of raindrops weights 18 g

b. 5,4x10²¹ moles of raindrops are in Pacific Ocean

Explanation:

a. Chemical composition of raindrops is water that is composed by two hydrogen (One hydrogen mole weights 1 g) and one oxygen (One oxygen mole weights 16 g). Thus, one water mole weights:

16 g + 1 g + 1 g = 18 g

b. 96,5 % of Pacific Ocean is water (Raindrops). So, the mass of raindrops in Pacific Ocean is:

1x10²⁰ kg × 96,5% = 9,65×10¹⁹ kg of raindrops

With the molar mass of raindrops (18 g/ 1 mol) it is possible to know the moles of raindrops in the Pacific Ocean, thus:

9,65×10¹⁹ kg of raindrops × (1000 g / 1 kg) × ( 1 mol of raindrops / 18 g) =

                                                 kg to g                    g to moles

5,4x10²¹ moles of raindrops in the Pacific Ocean

I hope it helps!

Explanation:

a) 1 mole = particles/atoms/ molecules

Mass of a rain drop = 50 mg

Mass of rain drops:

Mass of 1 mole of rain drop =

b) Mass of pacific ocean = M =

1 kg = 1,000,000 mg

Mass of 1 mole of rain drop =

Let the number moles rain drops in the pacific ocean be x.

23.6 ≈ 24

There are 24 moles of rain drops in the pacific ocean.

the answer is either b or c

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