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3 years ago

A certain material has a mass of 12.48 g while occupying 12.48 cm3 of space. What is this material?

Chemistry

2 answers:

Salsk061 [2.6K]3 years ago

5 0

This material has a density of 1 g/cm3.
(since 12.48 g/ 12.48 cm3 = 1 g/cm3)

Therefore, this material is water.

Sliva [168]3 years ago

5 0

Answer: The material is water as it has density of $1g/cm^3$

Explanation:

Density is defined as the mass contained per unit volume. It is characteristic of a material.

$Density=\frac{mass}{Volume}$

Given : Mass of object =12.48 grams

Volume of the object = $12.48cm^3$

Putting in the values we get:

$Density=\frac{12.48g}{12.48cm^3}$

$Density=1g/cm^3$

Thus the density of the material is $1g/cm^3$ and material is water which has density of $1g/cm^3$ .

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3 years ago

What is the theoretical yield of Calcium if we begin with 12.6 grams of Aluminium?

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The question is incomplete, here is the complete question:

The given chemical reaction is:

$2Al+3Cu(NO_3)_2\rightarrow 3Cu+2Al(NO_3)_3$

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<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of aluminium = 12.6 g

Molar mass of aluminium = 27 g/mol

Putting values in equation 1, we get:

$\text{Moles of aluminium}=\frac{12.6g}{27g/mol}=0.467mol$

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$2Al+3Cu(NO_3)_2\rightarrow 3Cu+2Al(NO_3)_3$

By Stoichiometry of the reaction:

2 moles of aluminium produces 3 moles of copper

So, 0.467 moles of aluminium will produce = $\frac{3}{2}\times 0.467=0.7005mol$ of copper

Now, calculating the mass of copper from equation 1, we get:

Molar mass of copper = 63.5 g/mol

Moles of copper = 0.7005 moles

Putting values in equation 1, we get:

$0.7005mol=\frac{\text{Mass of copper}}{63.5g/mol}\\\\\text{Mass of copper}=(0.7005mol\times 63.5g/mol)=44.48g$

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3 years ago

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RideAnS [48]

The question is incomplete. The complete question is :

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