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levacccp [35]
3 years ago
12

What is the density of 35 ml of a liquid that has a mass of 28.7 g?

Chemistry
2 answers:
omeli [17]3 years ago
4 0
Hey there!:

Mass = 28.7 g

Volume = 35 mL

Therefore:

D = m / V

D = 28.7 / 35

D = 0.82 g/mL
Nadya [2.5K]3 years ago
3 0

Answer: The density of the liquid will be 0.82 g/ml.

Explanation:

Density is defined as the mass contained per unit volume.

Density=\frac{mass}{Volume}

Given : Mass of liquid = 28.7 grams

Volume of liquid  = 35 ml

Putting in the values we get:

Density=\frac{28.7g}{35ml}=0.82g/ml

Thus density of the liquid will be 0.82g/ml

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What is the molarity of a solution that contains 87.75g of NaCI in 500.ml of solution
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Answer:

M = 3.0 mol/L.

Explanation:

  • We can calculate the molarity of a solution using the relation:

<em>M = (mass x 1000) / (molar mass x V)</em>

  • M is the molarity "number of moles of solute per 1.0 L of the solution.
  • mass is the mass of the solute (g) (m = 87.75 g of NaCl).
  • molar mass of NaCl = 58.44 g/mol.
  • V is the volume of the solution (ml) (V = 500.0 ml).

∴ M = (mass x 1000) / (molar mass x V) = (87.75 g x 1000) / (58.44 g/mol x 500.0 ml) = 3.0 mol/L.

6 0
3 years ago
The enthalpy of combustion of naphthalene (MW = 128.17 g/mol) is -5139.6 kJ/mol. How much energy is produced by burning 0.8210 g
bazaltina [42]

The energy produced by burning : -32.92 kJ

<h3>Further explanation</h3>

Delta H reaction (ΔH) is the amount of heat change between the system and its environment

(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)

The enthalpy and heat(energy) can be formulated :

\tt \Delta H=\dfrac{Q}{n}\rightarrow n=mol

The enthalpy of combustion of naphthalene (MW = 128.17 g/mol) is -5139.6 kJ/mol.

The energy released for 0.8210 g of naphthalene :

\tt Q=\Delta H\times n\\\\Q=-5139.6~kJ/mol\times \dfrac{0.8210~g}{128.17~g/mol}~\\\\Q=-32.92~kJ

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A small container of perfume is opened in a classroom. Soon every student in the room smells the perfume. Explain this in terms
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When perfume or cologne is sprayed into the air, it turns into a gas and its particles mix with other air particles that quickly move around the room. This is because gas is the least dense of the three states of matter. It moves quickly into any space or volume because it has the least density. This is called diffusion, when molecules or particles move from areas with high concentration to low concentration areas. 

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The compound 3-methylpentane is an example of
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Answer:

A) An Alkaline

Explanation:

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2 years ago
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