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3 years ago

** 2. Where are each of the three particles located within the atom?

Chemistry

1 answer:

dedylja [7]3 years ago

5 0

Answer:

protons and neutrons located within the nucleus, with electrons in orbitals surrounding the nucleus.

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When heat is applied to 80 grams of CaCO3, it yields 39 grams of B. Determine the percentage of the yield.

EleoNora [17]

The question is incomplete, the complete question is:

When heat is applied to 80 grams of CaCO3, it yields 39 grams of CaO Determine the percentage of the yield.

CaCO3→CaO + CO2

Answer: The % yield of the product is 87.05 %

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

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

We are given:

Given mass of $CaCO_3$ = 80 g

Molar mass of $CaCO_3$ = 100 g/mol

Putting values in equation 1, we get:

$\text{Moles of }CaCO_3=\frac{80g}{100g/mol}=0.8mol$

For the given chemical reaction:

$CaCO_3\rightarrow CaO+CO_2$

By stoichiometry of the reaction:

If 1 mole of $CaCO_3$ produces 1 mole of CaO

So, 0.8 moles of $CaCO_3$ will produce = $\frac{1}{1}\times 0.8=0.8mol$ of CaO

We know, molar mass of $CaO$ = 56 g/mol

Putting values in above equation, we get:

$\text{Mass of CaO}=(0.8mol\times 56g/mol)=44.8g$

The percent yield of a reaction is calculated by using an equation:

$\% \text{yield}=\frac{\text{Actual value}}{\text{Theoretical value}}\times 100$ ......(2)

Given values:

Actual value of the product = 39 g

Theoretical value of the product = 44.8 g

Plugging values in equation 2:

$\% \text{yield}=\frac{39 g}{44.8g}\times 100\\\\\% \text{yield}=87.05\%$

Hence, the % yield of the product is 87.05 %

6 0

3 years ago

What is a relationship where one organism benefits while the other gets nothing

andreev551 [17]

The answer is commensalism

8 0

4 years ago

A piece of magnesium with a mass of 5.867 g was heated in a crucible which was open to the air. After the magnesium had combuste

morpeh [17]

The empirical formula of the magnesium oxide formed is MgO

Here given data is piece of magnesium with a mass = 5.867 g after the magnesium had combusted and allowed to cool down the product and mass = 8.956 g

The empirical formula is the simplest whole number ratio of atoms in a compound and the ratio of atoms is the same as the ratio of moles and when crucible react with magnesium and air means oxygen then magnesium reacts readily with oxygen in the air, to produce magnesium oxide then chemical reaction is written as follows:

2Mg + O₂ → 2MgO

and hence when it cool down automatically the mass of magnesium is more than 1st mass because in that oxygen of air are added and that's why MgO are made the empirical formula of the magnesium oxide formed is MgO

Know more about magnesium oxide formed.

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3 0

1 year ago

Consider the following equilibrium: Ag+(aq)+Cl−(aq)⇌AgCl(s). Use Le Chatelier's principle to predict how the amount of solid sil

nika2105 [10]

Answer:

Increasing the reactants in the reaction.

Explanation:

By Le Chatelier's principle, any additional reactant added to the system (silver or chlorine reactant) would shift the reaction equilibrium to the right, favouring the product formation. That is more product is formed when the equilibrium is disturbed by adding more reactant.

I hope this explanation is clear.

5 0

4 years ago

Compare and contrast the results between the commercial and homemade pH test strips. Which test strips were more accurate? Expla

Ilya [14]

Answer:

See explanation

Explanation:

Homemade pH test strips make it a bit difficult to identity the colours that indicate various values of pH on a pH colour scale. These homemade pH strips make the results of the experiment more prone to human error. Also the creator of the test strip is also prone to human error during the creation of the strip.

The commercial pH test strips are more accurate when used.

7 0

3 years ago