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zhuklara [117]
3 years ago
7

Scientists think the earth is approximately how old?

Chemistry
2 answers:
tiny-mole [99]3 years ago
6 0

I think the answer is approximately 4.12 billion years since the amount of years is 4.543 billion years

AlexFokin [52]3 years ago
4 0

Answer:

Option C. 4.12 Billion years. Hope this helps!!

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Covalent compounds are formed when
dusya [7]
<span>a nonmetal bonds with a nonmetal, eg. Carbon and Oxygen form CO2 or CO

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8 0
3 years ago
How many moles of carbon are in 3.0 moles of C6H12O6?
AleksandrR [38]

Hey there!:

1 mole of  C6H12O6 ------------------ 6 moles of C

3.0 moles of C6H12O6 ------------- ??

3.0 *6 / 1 =>

18.0 moles of C


Hope that helps!

3 0
3 years ago
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During an investigation a scientist heated 27 g of mercuric oxide till it decomposed to leave a dry product. The total mass of t
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The law of conservation holds true always so there the last two grams has be lost as a gas probably
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3 years ago
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Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s) + 2HCl(aq) --&gt; ZnCl2(aq) + H2(g) When a 12.7 g chunk of zinc
ollegr [7]

Answer:

\boxed{\text{0.673 mol/L}}

Explanation:

We are given the amounts of two reactants, so this is a limiting reactant problem.

1. Data:

We know we will need an equation with masses and molar masses, so let’s gather all the information in one place.  

M_r:            65.38

                     Zn   +   2HCl ⟶ ZnCl₂ + H₂

m/g:             12.7

V/mL:                      5.00×10²

c/mol·L⁻¹:                  1.450

2. Moles of each reactant  

(a) Moles of Zn

n = \text{12.7 g Zn} \times \dfrac{\text{1 mol Zn}}{\text{65.38 g Zn}} = \text{0.1942 mol Zn}

(b) Moles of HCl

V = 5.0× 10² mL = 0.5000 L

n = \text{0.5000 L HCl}\times \dfrac{\text{1.450 mol HCl}}{\text{1 L HCl}} = \text{0.7250 mol HCl}

3. Identify the limiting reactant

Calculate the moles of ZnCl₂ obtained from each reactant

(i) From Zn

The molar ratio is 1 mol ZnCl₂:1 mol Zn

n = \text{0.1942 mol Zn} \times \dfrac{\text{1 mol ZnCl}_{2}}{\text{1 mol Zn}} = \text{0.1942 mol ZnCl}_{2}

(ii) From HCl

The molar ratio is 1 mol ZnCl₂:2 mol HCl

n = \text{0.7250 mol HCl} \times \dfrac{\text{1 mol ZnCl}_{2}}{\text{2 mol HCl}} = \text{0.3625 mol ZnCl}_{2}

Zinc is the limiting reactant, because it produces fewer moles of ZnCl₂.

4. Moles of HCl reacted

The molar ratio is 2 mol HCl:1 mol Zn

n = \text{0.1942 mol Zn} \times \dfrac{\text{2 mol HCl}}{\text{1 mol Zn}} = \boxed{\text{0.3885 mol HCl}}

5. Moles of HCl remaining

n = 0.7250 - 0.3885 = 0.3365 mol HCl

6. Concentration of hydrogen ions

The HCl is completely dissociated.

c = \dfrac{\text{0.3365 mol}}{\text{0.5000 L}} = \textbf{0.673 mol/L}\\\\\text{The concentration of hydrogen ions is $\boxed{\textbf{0.673 mol/L}}$}

4 0
3 years ago
In the process of photosynthesis, sunlight is converted into
Lady bird [3.3K]

Answer:

Chemical energy

Explanation:

By the use of electrons and protons from water

5 0
3 years ago
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