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2 years ago

An unknown liquid has a mass of 4.25 × 108 mg and a volume of 0.250 m3. what is the density of the liquid in units of g/ml?

2 answers:

8 0

Density= mass/volume
step one :
convert m3 to ml
1m^3 =1000000ml
0.250m^3 x1000000=250000ml

step two: convert mg to g
1mg=0.001g, therefore 4.25 x108mg=0.459g
density is therefore= 0.459g/250000=1.836 x10^-6g/ml

Kamila [148]2 years ago

6 0

Density of the liquid in units of g/ml is $1.836 \times 10^{-6} g / \mathrm{ml}$

Explanation:

Density of liquid is the mass of the liquid ids divided by its volume.

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

Given Mass = 4.25×108 mg

= 459mg

= 0.459g

Volume = $0.250 m^{3}$

Therefore, density = $\frac{0.459}{0.250}$

= $1.836 \mathrm{g} / \mathrm{m}^{3}$

converting to $m^{3}$ to ml ( $m^{3}$ = 1000000ml)

= $1.836 \times 10^{-6} g / \mathrm{ml}$

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2 years ago

Which of the following statements describe chemical properties?

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Answer:

A. Oxygen gas supports combustion.

B. Hydrofluoric acid reacts with glass.

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Explanation:

Chemical properties can only be observed when a chemical change, i.e. a change in the chemical composition, occurs.

On the other hand, physical properties are observed or measured without altering the composition of the substances.

Typical examples of chemical properties are reactivity, flammability, combustion, oxidation states, acidity, among others that require to carry out a chemical reaction to be observed.

Typical examples of physical properties are freezing point, melting point, boiling point, density, solubility, corrosiveness, among others.

Thus, as for the choices you have:

A. Oxygen gas supports combustion: the only way to observe this property is by carrying out a combustion reaction, so this describes a chemical property.

B. Hydrofluoric acid reacts with glass: again, only by letting hydrofluoric acid react with glass this can be observed, so this is another example of a chemical property.

C. Fertilizers help to increase agricultural production: fertilizers are absorbed by the plants and converted by biochemical reactions, so this also describes a chemical property.

D. Water boils below 100°C on top of a mountain: boiling is a change of state, the water is H₂O and continues having the same composition after boiling, so this describes a physical property.

E. Lead is denser than aluminum: density is measured by physical media, measuring mass and volume; so this is a physical property.

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2 years ago

At a temperature of __________ °c, 0.444 mol of co gas occupies 11.8 l at 889 torr.

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2 years ago

How does 0.5 m sucrose (molecular mass 342) solution compare to 0.5 m glucose (molecular mass 180) solution?

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Here, only molarity values are given; where molarity is a measurement of concentration in terms of moles of the solute per liter of solvent.

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Addition of molar mass for individual substance is not needed. As if both are considered in 1 Liter they would have same moles which is 0.5.

We can calculate the number of molecules for each;

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