How many atoms are in 1.3g C? Answer in Units of Atoms

Chemistry

1 answer:

Dima020 [189]3 years ago

3 0

Answer:Okay, so first, let's turn the grams into moles.

1.3 g C / 12.011 g/mol = 0.1082341187 mol C

Next, we need to multiply it by Avogadro's Number for the number of atoms.

0.1082341187 mol C * 6.022*10^23 mol^-1 = 6.51785863*10^22 atoms C

Now we take significant figures into consideration. We started with two, so we need to end it with two.

6.5*10^22 atoms C

Explanation:

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otez555 [7]

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Explanation:

5 0

3 years ago

Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction:P4(g) + 10 Cl2(g) → 4PCl5(s) ΔH°

miskamm [114]

<u>Answer:</u> The $\Delta H^o_{rxn}$ for the reaction is -1835 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:

$P_4(g)+10Cl_2(g)\rightarrow 4PCl_5(s)$ $\Delta H^o_{rxn}=?$