4 years ago

How many significant figures does 16.00 contain

Chemistry

1 answer:

VMariaS [17]4 years ago

4 0

2 is the answer because 16 is a real number

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nydimaria [60]

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djverab [1.8K]

Answer: The enthalpy of the reaction for given amount of aluminium will be $-51.0\times 10^2kJ$

Explanation:

We are given:

Moles of aluminium = 12 moles

For the given chemical reaction:

$2Al(s)+Fe_2O_3(s)\rightarrow 2Fe(s)+Al_2O_3(s);\Delta H^o_{rxn}=-850kJ$

By Stoichiometry of the reaction:

If 2 moles of aluminium produces -850 kJ of energy.

Then, 12 moles of aluminium will produce = $\frac{-850kJ}{2mol}\times 12mol=-5100kJ$ of energy.

Converting this into three significant figures, we get:

$\Rightarrow -5100kJ=-51.0\times 10^{2}kJ$

Thus, the enthalpy of the reaction for given amount of aluminium will be $-51.0\times 10^2kJ$

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3 years ago

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