3 years ago

How many moles are in 100 grams of gold?

Chemistry

1 answer:

raketka [301]3 years ago

4 0

Answer:

0.01 mole

Explanation:

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A certain atom has a nucleus containing six protons and eight neutrons and has six electrons orbiting the nucleus

zavuch27 [327]

Answer:

The answer is a carbon isotope.

Explanation:

Carbon has 6 protons and electrons so the atom is neutral.

However it is a carbon isotope because it has more neutrons than protons so be aware of that

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Ethanol, C2H6O, is most often blended with gasoline - usually as a 10 percent mix - to create a fuel called gasohol. Ethanol is

ch4aika [34]

Answer:

4054 kcal of heat is released during complete combustion of 354 g of octane.

Explanation:

Heat of combustion of 1 mol of octane is $1.308\times 10^{3}$ kcal

Molar mass of octane = 114.23 g/mol

We know, no. of moles = (mass)/(molar mass)

So, $1.308\times 10^{3}$ kcal of heat is released during complete combustion of 114.23 g of octane.

So, amount of heat is released during complete combustion of 354 g of octane = $(\frac{1.308\times 10^{3}}{114.23})\times 354$ kcal = 4054 kcal

Hence 4054 kcal of heat is released during complete combustion of 354 g of octane.

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3 years ago

How many valence electrons do the alkaline earth metals have?

fenix001 [56]

Answer:

$\boxed{2}$

Explanation:

Alkaline earth metals are in group 2. The number of valence electrons of elements in group 2 is 2.

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Magnesium(?)
<span>2 HCl + Mg ? MgCl2 + H2</span>

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That would be an ion, so A.

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