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labwork [276]
3 years ago
8

A block of material has a volume of 2 mº. It has a mass of 1 x 104 kg. Calculate the density of the materia

Chemistry
1 answer:
irina1246 [14]3 years ago
4 0

Answer:

d = 0.5×10¹g/cm³

Explanation:

Given data:

Volume of material = 2 m³

Mass of material = 1×10⁴ Kg

Density of material = ?

Density:

Density is equal to the mass of substance divided by its volume.

Formula

d = m/v

Solution:

Volume of material = 2 m³

1 m³ = 1000000 cm³

2 ×10⁶cm³

Mass of material = 1×10⁴ Kg

1 Kg = 1000 g

1×10⁷ g

by putting values into density formula

d = 1×10⁷ g/2 ×10⁶cm³

d = 0.5×10⁷⁻⁶ g/cm³

d = 0.5×10¹g/cm³

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Answer:

a) 377 k

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opper(I) ions in aqueous solution react with NH 3 ( aq ) according to Cu + ( aq ) + 2 NH 3 ( aq ) ⟶ Cu ( NH 3 ) + 2 ( aq ) K f =
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Answer:

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Explanation:

The dissolved amount of sparingly soluble salts is interlinked with a unitlesss quantity called as solubility product. It is a fixed quantity that only increases with the rise in temperatures and is used to predict the salting out of compounds. If the value of ionic product (Q) is larger than (Ksp), precipitation of compound occurs.

Given:

The solubility product of CuBr is 6.3×10−9.

The concentration of NH3 is 0.10 M.

Formula and Calculations:

The dissolution reaction (I) of CuBr is shown below.

The reaction showing dissolution of CuBr in NH3 is shown below.

The above reaction can be obtained by adding reaction (I) and (II) as shown below.

The equilibrium constants will get multiplied.

Suppose the solubility of CuBr is “s”.

It is given that concentration of NH3 is 0.10 M.

The equilibrium constant expression for the above reaction is as follows,

Here,

The concentration of pure solids is 1 M. Thus, the concentration of CuBr is 1 M.

As calculated, the value of Ksp is 396.9.

Substitute all the required values in above formula.  

On further solving above equation,

Therefore, the solubility of CuBr in ammonia is 0.386 M.

The formula to calculate solubility

Solubuility (g/l)= Molarity(M) x Molarmass

Chemistry homework question answer, step 2, image 10

The molar mass of CuBr is 143.45 g/mol.

The formula to calculate solubility in g/L is given below.

The molar mass of CuBr is 143.45 g/mol.

therefore,

solubility = 0.386M x 143.45g/mol

where (M = mol/l)

solubility = 55.375g/l

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Small children are occasionally injured when they try to inhale helium from a compressed helium tank. If a small child tries to
swat32

Answer:

26.0 moles

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During change of phase, the molecules of a substance acquire enough kinetic energy to overcome the forces of attraction between its molecules.

<h3>What is change of phase?</h3>

Change of phase occurs when a substance acquires enough energy to overcome the forces of attraction between its molecules to transition from one state of matter to another.

During a change of phase, kinetic energy of the molecules of the substance increases due to the application of heat, and the freedom of movement of the molecules increases.

Change of phase can occur as follows;

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Therefore, during change of phase, the molecules of a substance acquires enough kinetic energy to overcome the forces of attraction between its molecules leading to increased freedom of movement of the molecules.

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