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sammy [17]
3 years ago
14

You need 2.5 moles of aluminum for an experiment. How many atoms of aluminum is this?​

Chemistry
1 answer:
emmainna [20.7K]3 years ago
3 0

Answer:

1.505×10^24 atoms

Explanation:

1mole=6.02×10^23 atoms

2.5moles=?

(crossmultiply)

2.5×6.02×10^23 ÷1

=1.505×10^24 atoms

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The molar heat of fusion of gold is 12.550 kJ mol–1. At its melting point, how much mass of melted gold must solidify to release
KATRIN_1 [288]

The mass of melted gold to release the energy would be  3, 688. 8 Kg

<h3>How to determine the mass</h3>

The formula for quantity of energy is given thus;

Q = n × HF

Where n represents number of moles

HF  represents  heat of fusion

To find the number of moles, we have

235.0 = n × 12.550

number of moles = \frac{235}{12. 550} = 18. 725 moles

Note that molar mass of Gold is 197g/ mol

Let's note that;

Number of moles = mass/ molar mass

Mass = number of moles × molar mass

Mass = 18. 725 × 197

Mass = 3, 688. 8 Kg

Thus, the mass of melted gold to release the energy would be  3, 688. 8 Kg

Learn more about molar heat of fusion here:

brainly.com/question/15634085

#SPJ1

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