Question 20 a raindrop has a mass of 50.mg and the pacific ocean has a mass of ×7.081020kg . use this information to answer the questions below. be sure your answers have the correct number of significant digits.

1. The mass of one mole of raindrops = 3.0.10¹⁹ kg

2. 24 moles of raindrops are in the pacific ocean

A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12

1 mole = 6.02.10²³ particles

While the number of moles can also be obtained by dividing the mass (in grams) with relative atomic/molecular mass

Questions to complete:

1. A raindrop has a mass of 50 mg (5.10⁻² g) while in 1 mole raindrop there are 6.02.10²³ raindrop particles, so that the total mass of 1 mole of raindrop is:

6.02.10²³. 5.10⁻²= 3.01.10²² g

2 significant number = 3.0.10²² g = 3.0.10¹⁹ kg

2. The pacific ocean has a mass of × 7.08.10²⁰kg, then the number of moles of raindrop =

7.08.10²⁰kg / 3.0.10¹⁹ = 23.6 mole

2 significant number (round up) = 24 mole

electrons in a pure gold coin

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moles of water

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moles of NaOH

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Keywords: mole, raindrop, mass, Avogadro, significant number