I need help can someone help me please?

Chemistry

1 answer:

Eddi Din [679]3 years ago

4 0

Answer:

I believe is it trilobites.

Explanation:

They are able to be dated back by looking at the rocks they are in to help geologists.

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ArbitrLikvidat [17]

Answer:

Explanation:

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3 years ago

Wihat prrase best defines a star systerm?

lubasha [3.4K]

Answer:

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Explanation:

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3 years ago

In the following combustion reaction, what is the mole ratio of ethane (C2H6) to carbon dioxide? 2 C2H6 + 7 O2(g) 4 CO2 + 6 H2O

Gwar [14]

The answer you are looking four is 4/2 or 4CO2/2C2H6

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3 years ago

Read 2 more answers

What is unchanged when a solution is diluted by the addition of solvent?

grin007 [14]

Answer:

The moles of solute

Explanation:

When you make a dilution, moles of solute does not change when you add solvent.

In concentrated solution, you have x moles of solute, that will be the same in the diluted solution.

Relation between molarity or volume of concentrated and diluted solutions is called, "dilution factor".

When you calculate the dilution factor: you use this formula

Molarity concentrated . Concentrated volume = M diluted . Diluted volume

M concentrated / M Diluted = Diluted volume / Concentrated volume

5 0

3 years ago

Use the ΔHrxn values of the following reactions: 2SO2(g) + O2(g) → 2SO3(g) ΔHrxn = –196 kJ 2S(s) + 3O2(g) → 2SO3(g) ΔHrxn = –790

sesenic [268]

<u>Answer:</u> The $\Delta H^o_{rxn}$ for the reaction is -297 kJ.

<u>Explanation:</u>

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.

The given chemical reaction follows:

$S(s)+O_2(g)\rightarrow SO_2(g)$ $\Delta H^o_{rxn}=?$