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3 years ago

Order the units or geologic time from the longest to the shortest era, period, epoch, eon.

Chemistry

1 answer:

sweet [91]3 years ago

3 0

Answer:

The geological time from the longest to the shortest are:

Eon,
Era,
Period and,
Epoch.

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Calcium carbonate forms limestone, one of the most common rocks on Earth. It also forms stalactites, stalagmites, and many other

max2010maxim [7]

Answer: $CaCO_3(s)\rightarrow CaO(s)+CO_2(g)$ , 0.533 L

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

$CaCO_3(s)\rightarrow CaO(s)+CO_2(g)$

According to avogadro's law, 1 mole of every substance occupies 22.4 L of volume at STP.

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

moles of calcium carbonate = $\frac{2.38g}{100g/mol}=0.0238mol$

As 1 mole of calcium carbonate produces = 22.4 L of carbon dioxide at STP

Thus 0.0238 moles of calcium carbonate produces = $\frac{22.4 L}{1}\times 0.0238=0.533L$ of carbon dioxide at STP

3 0

3 years ago

For a particular isomer of C 8 H 18 , the combustion reaction produces 5113.3 kJ of heat per mole of C 8 H 18 ( g ) consumed, un

ale4655 [162]

Answer:

ΔH°f(C₈H₁₈(g)) = -210.9 kJ/mol

Explanation:

Let's consider the combustion of C₈H₁₈.

C₈H₁₈(g) + 25/2 O₂(g) ⟶ 8 CO₂(g) + 9 H₂O(g) ΔH°rxn = − 5113.3 kJ

We can calculate the standard enthalpy of formation of C₈H₁₈(g) using the following expression.

ΔH°rxn = 8 mol × ΔH°f(CO₂(g)) + 9 mol × ΔH°f(H₂O(g)) - 1 mol × ΔH°f(C₈H₁₈(g)) - 25/2 mol × ΔH°f(O₂(g))

1 mol × ΔH°f(C₈H₁₈(g)) = 8 mol × ΔH°f(CO₂(g)) + 9 mol × ΔH°f(H₂O(g)) - 25/2 mol × ΔH°f(O₂(g)) - ΔH°rxn

1 mol × ΔH°f(C₈H₁₈(g)) = 8 mol × (-393.5 kJ/mol) + 9 mol × (-241.8 kJ/mol) - 25/2 mol × 0 kJ/mol - (− 5113.3 kJ)

ΔH°f(C₈H₁₈(g)) = -210.9 kJ/mol

5 0

3 years ago

What is an example of the strong nuclear force?

Lina20 [59]

Here are two examples of strong nuclear force !

Protons and nucleons

I hope that's help !

5 0

4 years ago

Why is it difficult for countries to reduce emissions of carbon dioxide

Natalka [10]

Answer:

Curbing global carbon dioxide emissions has been a challenge, primarily because they are being driven higher by countries with low per capita emissions.

Explanation:

"just trust me bro"

3 0

3 years ago

Help now!!!

kumpel [21]

The balanced chemical equation when sodium and oxygen react is as below

4 Na + O₂ → 2 Na₂O

<em><u> Explanation</u></em>

From equation above 4 moles of sodium (Na) react with 1 mole of oxygen (O₂) to produce sodium oxide ( Na₂O)

Since there is equal number number of atoms in side of reactants and in the side of product the equation is balanced.

For example there is 4 atoms of Na in side of reactant and 4 in side of product.

3 0

3 years ago