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3 years ago

A solid object has a mass of 30 grams and a volume of 10 cm3.

2 answers:

german3 years ago

7 0

To find the density of an object, you need to use the equation: D = M/V. This is density equals mass over volume.

Mass: 30 g
Volume: 10 cm3

30/10 = 3

Density: 3 g/cm3

tresset_1 [31]3 years ago

6 0

Answer: The density of the object is equal to $3g/cm^3$

Explanation:

Density of an object is defined as the ratio of its mass and volume. The chemical equation representing density of an object is:

$\text{Density of an object}=\frac{\text{Mass of an object}}{\text{Volume of an object}}$

We are given:

Mass of an object = 30 grams

Volume of an object = $10cm^3$

Putting values in above equation, we get:

$\text{Density of an object}=\frac{30g}{10cm^3}=3g/cm^3$

Hence, the density of the object is equal to $3g/cm^3$

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A sample of 508.4 grams of copper completely reacted with oxygen to form 572.4 grams of a copper oxide product. how many grams o

Svet_ta [14]

According to law of conservation of mass, mass can neither be destroyed nor created in a chemical reaction. Thus, sum of masses of reactants must be equal to sum of masses of products in a reaction.

The chemical reaction is as follows:

$2Cu+O_{2}\rightarrow 2CuO$

Here, sum of masses of Cu and oxygen gas should be equal to CuO formed.

$2m_{Cu}+m_{O_{2}}=2m_{CuO}$

Thus, mass of oxygen will be:

$m_{O_{2}}=2(572.4-508.4)g=128 g$

This can be further proved as follows:

The balanced chemical reaction is as follows:

$2Cu+O_{2}\rightarrow 2CuO$

Here, 2 moles of Cu completely reacts with 1 mole of $O_{2}$ to give 2 moles of $CuO$ .

Thus, 1 mole of Cu reacts with 0.5 moles of $O_{2}$ .

The mass of Cu is 508.4 and molar mass is 63.546 g/mol, number of moles can be calculated as follows:

$n=\frac{m}{M}=\frac{508.4 g}{63.546 g/mol}=8 mol$

Thus, number of moles of $O_{2}$ reacting will be:

$n_{O_{2}}=8\times 0.5 mol=4 mol$

Molar mass of oxygen molecule is 32 g/mol thus, mass can be calculated as follows:

m=n×M=4 mol×32 g/mol=128 g/mol

This satisfies the law of conservation of mass.

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3 years ago

(b) Do compounds of hydrogen exhibit a relatively large or small kinetic isotope effect? Explain.

joja [24]

Compounds of hydrogen exhibit a relatively large kinetic isotope effect.

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Learn more about kinetic isotope effect here:

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2 years ago

What are some examples of supersaturated solutions? Give 10.

Phantasy [73]

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3 years ago

How many moles of ions are in 1.45 mol of K2SO4 ?

leonid [27]

Answer:

Explanation:

First we look generally at what makes K2SO4.

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Alla [95]

Answer:

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