Chemistry, 20.01.2020 20:31 mel2001love

Determining density and using density to determine volume or mass

(a) calculate the density of mercury if 1.00 × 10 g occupies a volume of 7.36 cm
(b) calculate the volume of 65.0 g of liquid methanol (wood alcohol) if its density is 0.791 g/ml.
(c) what is the mass in grams of a cube of gold (density = 19.32 g/cm) if the length of the cube is 2.00 cm?
(d) calculate the density of a 374.5-g sample of copper if it has a volume of 41.8 cm a student needs 15.0 g of ethanol for an experiment. if the density of ethanol is 0.789 g/ml, how many milliliters of ethanol are needed? what is the mass, in grams, of 25.0 ml of mercury (density = 13.6 g/ml)?

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Answer from: nathanthomasmoses

corrected question:

Determining Density and Using Density to Determine Volume or Mass

(a) Calculate the density of mercury if 1.00 × 10 g occupies a volume of 7.36 cm³

(b) Calculate the volume of 65.0 g of liquid methanol (wood alcohol) if its density is 0.791 g/mL.

(d) Calculate the density of a 374.5-g sample of copper if it has a volume of 41.8 cm³ A student needs 15.0 g of ethanol for an experiment. If the density of ethanol is 0.789 g/mL, how many milliliters of ethanol are needed? What is the mass, in grams, of 25.0 mL of mercury (density = 13.6 g/mL)?

density = $\frac{mass}{volume}$

ρ=m/v ,m=ρv, v=m/ρ

(a)m=1*10g , v=7.36cm³

ρ=10/7.36 =1.36g/cm³

(b) m=65g, ρ=0.791 g/mL.

v= 65/0.791 =82.17g/mL

m=19..32*8=154.56g/cm³

(d) mass of copper=374.5g , v=41.8cm³

ρ=374.5/41.8 =8.96g/cm³

mass of ethanol=15g, density of ethanol=0.789g/mL

v=15/0.789 =19.01mL

volume of mecury=25mL, density of mercury=13.6g/mL

m=25*13.6=340g

Answer from: lulprettyb

A) density of mercury = 13.59g/cm^3

B) volume =

C) mass =

D) density = 8.95g/cm^3

Explanation:

A) Given mass of mercury = 100 grams

Volume of mercury = 7.36 cm^3

Hence,

$density = \frac{Mass}{Volume}\\\\ density = \frac{100}{7.36} \\\\density = 13.59 g/cm^3$

B) Given mass = 65 grams

Density = 0.791 g/mL

Hence,

$volume = \frac{Mass}{Density}\\\\ volume = \frac{65}{0.791} \\\\volume = 82.17 ml$

C) Given density = 19.32 g/cm3

Side of the cube = 2 cm

Hence,

$volume of the cube = Side*Side*Side\\\\ volume = 2*2*2 \\\\volume = 8 cm^3$

Thus,

$mass of the cube = Volume*Density\\\\ mass = 8*19.32 \\\\mass = 154.56 grams$ .

D) $density = \frac{Mass}{Volume}$

$density = \frac{374.5}{41.8}\\\\density = 8.95g/cm^3$

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Determining density and using density to determine volume or mass

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