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2 years ago

Select the correct answer.

Chemistry

2 answers:

exis [7]2 years ago

4 0

Answer:

D.CaCl2

Explanation:

nataly862011 [7]2 years ago

4 0

Answer:

<h2>ans is D because the velency of calcium is 2 and clorine is 1 if we do cross multyply then it is option d</h2>

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Write this in a word and skeleton equation:

DiKsa [7]

Answer:

Write this in a word and skeleton equation:

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Explanation:

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2 years ago

An unknown amount of mercury (II) oxide was decomposed in the lab. Mercury metal was formed and 5.20 L of oxygen was released at

Yakvenalex [24]

Answer:

68.3g

Explanation:

1. Word equation:

mercury(II) oxide → mercury + oxygen

2. Balanced molecular equation:

2HgO → 2Hg + O₂(g)

3. Mole ratio

Write the ratio of the coefficients of the substances that are object of the problem:

$2molHgO/1molO_2$

4. Calculate the number of moles of O₂(g)

Use the equation for ideal gases:

$pV=nRT\\\\\\n=\dfrac{pV}{RT}\\\\\\n=\dfrac{0.970atm\times5.20L}{0.08206atm.L/K.mol\times 390.0K}\\\\\\n=0.1576mol$

5. Calculate the number of moles of HgO

$\dfrac{2molHgO}{1molO_2}\times 0.1576molO_2=0.315molHgO$

6. Convert to mass

mass = # moles × molar mass

molar mass of HgO: 216.591g/mol

mass = 0.315mol × 216.591g/mol = 68.3g

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When did the mass extinctions happen

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Answer:

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Explanation:

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