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3 years ago

A piece of metal with a mass of 147g and a volume of 21ml. Calculate the density of the metal.

Chemistry

2 answers:

irina1246 [14]3 years ago

8 0

Answer:

The density of the metal is 7 $\frac{g}{mL}$

Explanation:

Density is a quantity that allows you to measure the amount of mass in a given volume of a substance. The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

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

Density, according to the International System of Units, is usually expressed in kilogram per cubic meter ( $\frac{kg}{m^{3} }$ ) or gram per cubic centimeter ( $\frac{g}{cm^{3} }$ ). Although it can also be expressed in any other unit of mass by volume.

In this case you know:

mass= 147 g
volume= 21 mL

Then:

$density=\frac{147 g}{21 mL}$

density= 7 $\frac{g}{mL}$

The density of the metal is 7 $\frac{g}{mL}$

kipiarov [429]3 years ago

3 0

Answer:

density of a piece of metal = 7 gr/ml

Explanation:

See the file please

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The elemental analysis of an organic solid extracted from gum arabic (a gummy substance used in adhesives, inks, and pharmaceuti

Evgesh-ka [11]

Answer:

The molar mass of the organic solid is 120.16 g/mol.

The molecular formula of an organic solid is $C_4H_8O_4$

Explanation:

Let the molecular mass of an organic solid be $C_xH_yO_z$

$\Delta T_b=K_b\times m$

$Delta T_b=K_b\times \frac{\text{Mass of solid}}{\text{Molar mass of solid}\times \text{Mass of diphenyl in Kg}}$

where,

$\Delta T_f$ =Elevation in boiling point = $=1.5^oC$

Mass of organic solid= 0.561 g

Mass of diphenyl = 24.9 g = 0.0249 kg (1 kg = 1000 g)

$K_b$ = boiling point constant = 8.00 °C/m

m = molality

Now put all the given values in this formula, we get

$1.5^oC=8.00 ^oC/m\times \frac{0.561 g}{\text{Molar mass of solid}\times 0.0249 kg}$

${\text{Molar mass of solid}}=120.16 g/mol$

$\%=\frac{\text{Number of atoms}\times \text{mass of an atom}}{\text{molas mass of compound}}\times 100$

Percentage of carbon in an organic solid = 40.0%

$40\%=\frac{x\times 12 g/mol}{120.16 g/mol}\times 100$

x = 4.0

Percentage of hydrogen in an organic solid = 6.7%

$6.7\%=\frac{y\times 1 g/mol}{120.16 g/mol}\times 100$

y = 8.0

Percentage of hydrogen in an organic solid = 6.7%

$53.3\%=\frac{x\times 12 g/mol}{120.16 g/mol}\times 100$

y = 4.0

The molecular formula of an organic solid is $C_4H_8O_4$

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Answer:

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Explanation:

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Answer:

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Explanation:

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