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2 years ago

By the way...... what do those symbols for the elements have in common (for number 7-11): Pb, Au, Cu, Hg, Na ? *

Chemistry

2 answers:

Keith_Richards [23]2 years ago

8 0

Answer:

those have symbols for their Latin or Greek name

Explanation:

hope it helps

galina1969 [7]2 years ago

8 0

Answer:

Na number of 11

Explanation:

Pb no. 82

Au no. 79

Cu no. 29

Hg no. 80

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2 years ago

If it takes three "breathes" to blow up a balloon to 1.2 L, and each breath supplies the balloon with 0.060 moles of exhaled air

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3 years ago

If 5.00 grams of copper metal reacts with oxygen to produce 5.62 grams of 'copper oxide' ,what is the empirical formula of the '

a_sh-v [17]

Answer:

$Cu_2O$

Explanation:

Hello!

In this case, according to the law of conservation of mass, it is possible to realize that the mass of oxygen comes from the subtraction of the total mass and the mass of copper:

$m_O=5.62g-5.00g\\\\m_O=0.62gO$

Next, we compute the moles of both Cu and O given their atomic masses:

$n_{Cu}=5.00gCu*\frac{1molCu}{63.546gCu}=0.0787molCu\\\\n_O=0.62gO*\frac{1molO}{16.0 gO}=0.03875molO$

Now, we divide by the moles of oxygen as the fewest ones, in order to calculate their subscripts in the empirical formula:

$Cu=\frac{0.0787}{0.03875} =2.0\\\\O=\frac{0.03875}{0.03875} =1$

Therefore, the empirical formula turns out to be:

$Cu_2O$

Best regards!

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2 years ago