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3 years ago

5

A sample of seawater contains 1.3 g of calcium ions in 3,100 kg of solution. what is the calcium ion concentration of this solut

ion in units of ppm?

1 answer:

IrinaVladis [17]3 years ago

6 0

A unit of ppm has an acronym of parts per million. The equivalent units of ppm is therefore mg/L and mg/kg. So the ppm is:

mass Ca+ = 1.3 g = 1300 mg

ppm = 1300 mg / 3100 kg

<span>ppm = 0.42 ppm</span>

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Write the balanced chemical equation for the following reaction. Also, classify the

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3 years ago

An air-filled balloon has a volume of 225 L at 0.940 atm and 25 °C. Soon after, the pressure changes to 0.990 atm and the temper

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The right choice is V₂ = 195.7 L

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If n is constant, and have different values of P, V and T:

(P₁*V₁) / T₁ = (P₂ * V₂) / T₂

Knowing that:

V₁ = 225 L , P₁ = 0.940 atm

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applying in the above equation

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3 years ago

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4 years ago

Analysis of a sample of a compound, containing only carbon, nitrogen, hydrogen, and oxygen, determined that it contained 20.0% C

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Answer:

CH₄N₂O

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Let's assume 100 g of the compound, thus, the mass of each substance is it percent multiplied by 100:

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H = 6.7 g

N = 46.6 g

O = 100 - (20+6.7+46.6) = 26.7 g

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nC = 20/12.011 = 1.67 mol

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The empirical formula is the formula with the minimum possible number of the moles of each compound, which must be proportional to the percent of each one. So, we must divide each number of moles for the smallest, 1.67:

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So, the empirical formula is CH₄N₂O.

6 0

4 years ago