Question

How many moles of seawater are present in 220 milligrams?

Answer 1

to find :

moles of water in 220 milligrams

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water :

chemical formula :

H2O

H × 2 + 0

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molecular masses :

H = 1

02 = 16

2 × 1 + 16

18 u.

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18 u. is the molecular mass of water

18 g of water is called one mol

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18 g

18 × 1000 milligrams

18000 milligrams

18000 / 1 = 220 / ?

mol = 220 × 1 / 18000

mol= 0.012

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Answer 2

mol=0.012
is the answer