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3 years ago

8

- How many atoms are in 1.70 moles of Ca?

1 answer:

vazorg [7]3 years ago

6 0

Answer:

1 mole = 6.02 x 1023 atoms

Explanation:

6.5 moles 6.02 x 1023 atoms = 3.9 x 1024 atoms

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How many valence electrons are in an atom of phosphorus

dezoksy [38]

5 Valence electrons .......... Hope it helps, Have a nice day:)

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3 years ago

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Describe how the properties of elements in the same group differ to the properties of elements in the same period

Fofino [41]

Answer:

(a) (i) All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell. (ii) All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.

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3 years ago

Using the balanced equation for the combustion of ethane: 2C2H6 + 7O2 → 4CO2 + 6H2O, how many moles of O2 needed to produce 12 m

pickupchik [31]

Answer:

14 moles of oxygen needed to produce 12 moles of H2O.

Explanation:

We are given that balance eqaution

$2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O$

We have to find number of moles of O2 needed to produce 12 moles of H2O.

From given equation

We can see that

6 moles of H2O produced by Oxygen =7 moles

1 mole of H2O produced by Oxygen= $\frac{7}{6}$ moles

12 moles of H2O produced by Oxygen= $\frac{7}{6}\times 12$ moles

12 moles of H2O produced by Oxygen= $7\times 2$ moles

12 moles of H2O produced by Oxygen=14 moles

Hence, 14 moles of oxygen needed to produce 12 moles of H2O.

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3 years ago

Please complete the sentence. You can separate the parts of any mixture by using _____________ processes.

elena55 [62]

I believe the answer is filtration.

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In which layer of Earth’s interior does convection occur?

lianna [129]

Answer:

The mantel. I'm pretty sure.

Explanation:

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