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Stells [14]
3 years ago
7

A sample of metal has a mass of 18.20g, and a volume of 7.38mL. What is the density in g/cm^3?

Chemistry
1 answer:
AlexFokin [52]3 years ago
8 0
Density = Mass ÷ Volume. You get 2.466
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Look at the graph. Which part of the line shows a time<br> when the object was not moving?
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An excess of oxygen reacts with 451.4 g of lead, forming 374.7 g of lead(II) oxide. Calculate the percent yield of the reaction.
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Answer: The percent yield of the reaction is 77.0 %

Explanation:

2Pb+O_2\rightarrow 2PbO

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

\text{Number of moles of lead}=\frac{451.4g}{207.2g/mol}=2.18moles

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According to stoichiometry:

2 moles of Pb produces = 2 moles of PbO_2

2.18 moles of Pb is produced by=\frac{2}{2}\times 2.18=2.18moles of PbO_2

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3 0
3 years ago
A piece of copper has a volume 130 L. What is the mass of the sample, in units of kilograms?
Reil [10]

Answer: The mass of the sample is 1264.800 kg.

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Mass of the piece of copper = m

Volume of the copper price = 130 L=130,000 cm^3

1 L= 1,000 cm^3

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The mass of the sample is 1264.800 kg.

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The Groups 1 and 2 on the periodic table contain what atom type?
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