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4 years ago

13

which statement best describes why specific heat capacity is often more useful than heat capacity for scientists while comparing

two materials

1 answer:

Stolb23 [73]4 years ago

3 0

Its Specific heat capacity is an intensive property and does not depend on sample size.<span>
</span>

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Which of the following would be classified as an acid to the Arrhenius definition

mixer [17]

Any substance that increases the concentration of $H^+$ in aqueous solutions is Arrhenius's acid.

<h3>What are Arrhenius acids?</h3>

Arrhenius define acids as substances with the chemical capacities to increase the concentration of hydrogen ion in aqueous solutions.

Thus, substances like HCl, HNO3, HBr, etc. would be considered an acid. This is because they ionize in aqueous solutions as follows:

HCl ---> $H^+$ + $Cl^-$

$HNO_3 --- > H^+ + NO_3^-$

$HBr --- > H^+ + Br^-$

More on Arrhenius acids can be found here: brainly.com/question/9936252

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4 0

2 years ago

Read 2 more answers

The total mass of the atmosphere is about 5.00 x 1018 kg. How many moles each of air, O2, and CO2 are present in the atmosphere?

n200080 [17]

<u>Answer:</u> The moles of oxygen and carbon dioxide in air is $3.63\times 10^{19}mol$ and $7.18\times 10^{16}mol$ respectively

<u>Explanation:</u>

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

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of atmosphere = $5.00\times 10^{18}kg=5.00\times 10^{21}g$

Average molar mass of atmosphere = 28.96 g/mol

Putting values in above equation, we get:

$\text{Moles of atmosphere}=\frac{5.00\times 10^{21}g}{28.96g/mol}=1.73\times 10^{20}mol$

We know that:

Percent of oxygen in air = 21 %

Percent of carbon dioxide in air = 0.0415 %

Moles of oxygen in air = $\frac{21}{100}\times 1.73\times 10^{20}=3.63\times 10^{19}mol$

Moles of carbon dioxide in air = $\frac{0.0415}{100}\times 1.73\times 10^{20}=7.18\times 10^{16}mol$

Hence, the moles of oxygen and carbon dioxide in air is $3.63\times 10^{19}mol$ and $7.18\times 10^{16}mol$ respectively

6 0

3 years ago

Calculate the mass of magnesium oxide produced when 0.645 g of magnesium hydroxide is the is completely decomposed.

FrozenT [24]

Answer:

0.44g

Explanation:

Given parameters:

Mass of magnesium hydroxide = 0.645g

Solution

The balanced reaction equation is shown below:

Mg(OH)₂ → MgO + H₂O

From the equation above, we see that the number of atoms are conserved.

To find the mass of magnesium oxide produced, we find the number moles of the decomposed magnesium hydroxide first:

Molar mass of Mg(OH)₂ = 24 + 2(16+1) = 58g/mol

Number of moles of Mg(OH)₂ = $\frac{mass}{molar mass}$

= $\frac{0.645}{58}$

= 0.011mole

Now, from the balanced equaiton, we know that:

1 mole of Mg(OH)₂ produces 1 mole of MgO

Therefore, 0.011mole of Mg(OH)₂ will produce 0.011mole of MgO

so mass of MgO = number of moles of MgO x molar mass of MgO

Molar mass of MgO = 24 + 16 = 40g/mol

mass of MgO = 0.011 x 40 = 0.44g

8 0

4 years ago

Plastic is used to cover the copper wire in the power codes of appliances because plastic differs from copper in _________

Nezavi [6.7K]

Answer:

in copper from different plastics because appliances of codes to power day in wire copper the cover to use to plastic

4 0

3 years ago

How can the rate of a reaction be decreased?

Agata [3.3K]

Reducing surface area

3 0

4 years ago

Read 2 more answers