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Liula [17]
3 years ago
8

The volume of a 12.4 g metal pellet is measured by water displacement. It is added to a graduated cylinder filled with water, an

d the level rises from 10.00 mL to 13.65 mL. What is the density of the metal?
Chemistry
1 answer:
Vesna [10]3 years ago
5 0

Answer:

                3.39 g.mL⁻¹ or 3.39 g.cm⁻³

Solution:

Data Given:

                             Mass of Pellet  =  12.4 g

                             Volume of Pellet  =  13.65 mL - 10.00 mL  =  3.65 mL

                             Density  =  ?

Formula Used,

                             Density  =  Mass ÷ Volume

Putting values,

                             Density  =  12.4 g ÷ 3.65 mL

                             Density =  3.39 g.mL⁻¹ or 3.39 g.cm⁻³

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As we have the balanced reaction equation is:

N2O4 (g) ↔ 2NO2(g)

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KC = [NO2]^2[N2O4]^1

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is 2NO2 in the balanced equation.

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3 years ago
What are the similarities between DIFFUSION, FACILITATED DIFFUSION and OSMOSIS?
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6 0
3 years ago
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A solution is prepared by mixing 50.0 mL toluene (C6H5CH3 d=0.867 g/mL) with 125 mL Benzene (C6H6 d=0.874 g/mL). Assuming that t
Tatiana [17]

Answer:

mass % = 28.4%

mole fraction = 0.252

molality = 3.08 molal

molarity = 2.69 M

Explanation:

Step 1: Data given

Volume of toluene = 50.0 mL = 0.05 L

Density toluene = 0.867 g/mL

Molar mass toluene = 92.14 g/mol

Volume of benzene = 125 mL = 0.125 L

Density benzene = 0.874 g/mL

Molar mass benzene = 78.11 g/mol

Step 2: Calculate masses

Mass = density * volume

Mass toluene = 50.0 mL * 0.867 g/mL = 43.35 g

Mass benzene = 125 mL * 0.874 g/mL = 109.25 g

Step 3: Calculate number of moles

Moles = mass / molar mass

Moles toluene = 43.35 grams /92.14 g/mol = 0.470 5 moles

Moles benzene = 109.25 grams / 78.11 g/mol = 1.399 moles

Step 4: Calculate molarity of toluene

Molarity = moles / volume

Molarity toluene = 0.4705 moles / 0.175 L = 2.69 M

Step 5: Calculate mass % of toluene

Mass % = (43.35 grams / (43.35 + 109.25) )*100 % = 28.4 %

Step 6: Calculate mole fraction of toluene

Mole fraction toluene = Moles toluene / total number of moles

Mole fraction toluene = 0.4705 / (0.4705 + 1.399) = 0.252

Step 7: Molality of toluene

Molality = number of moles / mass

Molality of toluene = 0.4705 moles / (0.04335 + 0.10925)

Molality of toluene = 3.08 molal

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What is the pH of a solution whose hydronium ion [H20+] (or proton [H+1)
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Answer:

pH =  -  log(7.6 \times  {10}^{ - 5} )  \\ pH = 4.12

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2 years ago
What is the frequency of a photon that has a wavelength of 6.58 x 10-8m?
julsineya [31]

Answer:

6 x 10 (power to the 15) H2

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3 years ago
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