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3 years ago

The density of ethanol is 0.789 g/cm3 at 20°C. What volume of ethanol has a mass of 15.5 grams?

2 answers:

8 0

The density means that the mass divided by the volume with the formula: density = mass/volume. So volume=mass/density. Under same temperature, the volume=15.5/0.789=19.6 cm3=19.6 ml.

melisa1 [442]3 years ago

8 0

Answer:

Volume of ethanol = 19.6 cm3

Explanation:

Given:

Density of ethanol = 0.789 g/cm3

Mass of ethanol = 15.5 g

To determine:

The volume of ethanol corresponding to the given mass

Formula:

Density of a substance is essentially the mass occupied by it per unit volume

$Density = \frac{Mass}{Volume}$

Based on the above equation:

$volume = \frac{Mass}{Density} =\frac{15.5 g}{0.789g/cm3} =19.6 cm3$

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We must first put down the equation of reaction to guide our work while solving the problem.

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Mass of KCN reacted= 3.2 g

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Number of moles of KCN= 3.2/65.12 g/mol= 0.049 moles

Theoretical yield of HCN is obtained thus;

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1 mol of KCN produced 1 mole of HCN thus 0.049 moles of KCN will produce 0.049 moles of HCN.

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Molar mass of HCN= 27.0253 g/mol

Hence mass of HCN produced= 0.049mol × 27.0253 g/mol= 1.32g of HCN

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In finding the molarity of a solution, we use the following formula:

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The molar mass of NH4NO3 and (NH4)3PO4 are 80.043 g/mol and 149.0867 g/mol, respectively.

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Therefore, $[PO3−4]\\$ has a molarity of $1.48×10−3 M PO3−$

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