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3 years ago

The coal with the highest energy available per unit burned is

Chemistry

1 answer:

Oliga [24]3 years ago

3 0

Answer:

Anthracite

Explanation:

Anthracite variety of coal is the coal with the highest energy available per unit burned. Anthracite is hard, brittle, lustrous coal . They also often referred as hard coal. Anthracite has a high percentage of carbon and low percentage of volatile matter. Other varieties of coal are peat, lignite and bituminous.

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A 100g sample of Carbon-14 has a half-life of 5 years. How much Carbon-14 is left after 10 years?

attashe74 [19]

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Explanation:

Formula used :

$a=\frac{a_o}{2^n}$

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$a_o$ = Initial amount of the reactant = 100 g

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3 years ago

What is the appropriate chemical formula for Iron(III) Sulfate? Sulfate is SO_4^2 Fe3SO4 O a . Fe2(SO4)3 O b. O c. Fe2SO4 O d. F

AnnyKZ [126]

<u>Answer:</u> The chemical formula of Iron (III) sulfate is $Fe_2(SO_4)_3$

<u>Explanation:</u>

Iron is the 26th element of periodic table having electronic configuration of $[Ar]3d^64s^2$ .

To form $Fe^{3+}$ ion, this element will loose 3 electrons.

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By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

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