1. The mass of one mole of raindrops = 3.0.10¹⁹ kg
2. 24 moles of raindrops are in the pacific ocean
Further explanation
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
[tex]\large{\boxed{\bold{mole\:=\:\frac{grams}{the\:relative\:mass\:of\:elements\:or\:the relative\:mass\:of\:molecules} }}}[/tex]
Questions to complete:
- 1. What is the mass of one mole of raindrops ? and
- 2. How many moles of raindrops are in the pacific ocean
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
Learn more
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Keywords: mole, raindrop, mass, Avogadro, significant number
