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Marat540 [252]
3 years ago
15

What mass of gold (Au) contains the same number of atoms as 2.61 g of aluminum (Al)?

Chemistry
1 answer:
sleet_krkn [62]3 years ago
6 0

Answer:

19.11g

Explanation:

mole = mass ÷ molar mass

mole = 2.61 ÷ 27

mole = 0.097mol

Number of atoms in 2.61g of Aluminum = 6.022 × 10^23 × 0.097

= 0.584 × 10^23

= 5.84 × 10^22atoms

To get the same number of atoms for Gold (Au), we multiply the atomic mass of Au by 0.097mol

Atomic mass of Au = 197g/mol

mass = mole × molar mass

mass = 0.097 × 197

mass = 19.109g

mass = 19.11g

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How much energy is required to melt a 500. gram block of iron? The heat of vaporization is 6090 J/g and the heat of fusion is 24
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Answer:

Heat required = 1.23×10⁵J

Explanation:

Given:

Mass (m) = 500 gram

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Heat required

Computation:

Heat required = 247 J/g× 500 g

Heat required = 1.23×10⁵J

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4 years ago
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Explanation:

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