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4 years ago

Ocean water contains 3.5 nacl by mass. what mass of ocean water in grams contains 45.8 g of nacl

Chemistry

1 answer:

Romashka-Z-Leto [24]4 years ago

3 0

Mass percentage of sodium chloride(NaCl) in ocean waters = 3.5 %

That means 3.5 g sodium chloride(NaCl) is present for every 100 g of ocean water.

The given mass of sodium chloride(NaCl) is 45.8 g

Calculating the mass of ocean waters that would contain 45.8 g sodium chloride(NaCl):

$45.8 g NaCl *\frac{100g ocean water}{3.5g NaCl}$

= 1309 g ocean water

Therefore, 45.8 g sodium chloride is present in 1309 g ocean water.

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zepelin [54]

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3 years ago

What is the number of moles of kf in a 29-gram sample of the compound.

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Given

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To find

Number of moles of pottasium fluoride = ?

Solution

we know that molar mass of KF = 58.0967 g

Now,

$number \: of \: moles = \ \\ \frac{given \: weight \: of \: subtance}{molar \: mass}$

Number of moles = 29/58 = 0.5 moles

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2 years ago

How much heat is released if 7.15 g cao(s) is added to 152 g of h2o(l)? cao(s) + h2o(l) → ca(oh)2(s) δh°rxn = –64.8 kj/mol?

aniked [119]

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