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3 years ago

This element:

1 answer:

7 0

If it was in group 11 where both silver and gold is found, with copper as well, then the answer would be gold. It does have a d-orbital shell in its electron configuration and it is the heaviest in its group. It is common knowledge that it is used as a shiny metal for jewelry, which we can see on accessories nowadays.

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The overall cell reaction occurring in an alkaline battery isZn(s) + MnO₂(s) + H₂O(l) → ZnO(s) + Mn(OH)₂(s) (b) If 4.50 g of zin

Airida [17]

5.911 grams of manganese dioxide and 1.224 gram of water are consumed.

<h3>What is Balanced Chemical Equation ?</h3>

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

The given reaction balanced equation is:

Zn(s) + MnO₂(s) + H₂O(l) → ZnO(s) + Mn(OH)₂(s)

<h3>How to find the number of moles ?</h3>

To find the number of moles use the expression:

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

Here,

Mass of Zn = 4.50 g

Molar mass of Zn = 65.4 g/mol

Now put the value in above expression

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

= $\frac{4.5\ g}{65.4\ \text{g/mol}}$

= 0.068 mol

Mass of MnO₂ = Moles of MnO₂ × Molar mass of MnO₂

= 0.068 mol × 86.9368 g/mol

= 5.911 g

Mass of H₂O = Moles of H₂O × Molar mass of H₂O

= 0.068 mol × 18.0 g/mol

= 1.224 g

Thus from the above conclusion we can say that 5.911 grams of manganese dioxide and 1.224 gram of water are consumed.

Learn more about the Balanced chemical equation here: brainly.com/question/26694427

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4 0

1 year ago

Silver nitrate reacts with calcium to make calcium nitrate and silver. The reaction is exothermic and produces 18.7 kJ/mol of en

denis-greek [22]

Answer:

1.63 kilo Joules of energy will be produced when 14.8 g of silver nitrate react.

Explanation:

$AgNO_3+Ca\rightarrow Ag+CaNO_3,\Delta H_{rxn}=-18.7 kJ/mol$

Mass of silver nitrate = 14.8 g

Moles of silver nitrate = $\frac{14.8 g}{170 g/mol}=0.08706 mol$

According to reaction, when 1 mole of silver nitrate reacts with 1 mole of calcium it gives 18.7 kJ of heat.

Then amount of heat released when 0.08706 moles of silver nitrate reacts :

$0.08706\times 18.7 kJ=1.628 kJ\approx 1.63 kJ$

1.63 kilo Joules of energy will be produced when 14.8 g of silver nitrate react.

6 0

2 years ago

What are the concentrations of sugar

mariarad [96]

The easiest way to answer this question is to first figure out the molar mass of the sugar in question. To do this multiply the number of individual atoms for a given element by its atomic mass. 12 X 12.01 g/mol = 144.12 g/mol C. 22 X 1.008 g/mol = 22.176 g/mol H. 11 X 16.00 g/mol = 176.00 g/mol O.

4 0

3 years ago

Gravity is the force that keeps us on the Earth. It pulls us towards the

Andrei [34K]

Answer:

Gravitational potential energy

Explanation:

Because gravity is less on the poles

6 0

3 years ago

DNA makes RNA, which makes<br> O ATP<br> O plasma<br> O lipids<br> O proteins<br> HELP ASAP PLEASE!

Akimi4 [234]

Answer:

It makes proteins ....................

6 0

2 years ago