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Dima020 [189]
2 years ago
14

I NEED HELP THIS IS DUE TMR!

Chemistry
1 answer:
butalik [34]2 years ago
3 0

Answer:

The density of copper is 8.9 grams per cubic centimeter.

Explanation:

There is a writing mistake in statement, correct form is written below:

<em>A 124.6 grams sample of copper has a volume of 14 cubic centimeters. What is the density of copper?</em>

Let suppose that mass of the copper sample is distributed uniformly in its volume, then we shall use the following definition of density (\rho), in grams per cubic centimeter:

\rho = \frac{m}{V} (1)

Where:

m - Mass, in grams.

V - Volume, in cubic centimeters.

If we know that m = 124.6\,g and V = 14\,cm^{3}, then the density of the sample of copper is:

\rho = \frac{m}{V}

\rho = 8.9\,\frac{g}{cm^{3}}

The density of copper is 8.9 grams per cubic centimeter.

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If have a volume of 18 L of a gas at a temperature of 272 K and a pressure of 90 atm, what will be the pressure of the gas if ra
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Answer:

P₂ ≅ 100 atm (1 sig. fig. based on the given value of P₁ = 90 atm)

Explanation:

Given:

P₁ = 90 atm                    P₂ = ?

V₁ = 18 Liters(L)              L₂ = 12 Liters(L)      

=> decrease volume => increase pressure

=> volume ratio that will increase 90 atm is (18L/12L)                                                                  

T₁ = 272 Kelvin(K)          T₂ = 274 Kelvin(K)

=>  increase temperature => increase pressure

=> temperature ratio that will increase 90 atm is (274K/272K)

n₁ = moles = constant    n₂ = n₁ = constant

P₂ = 90 atm x (18L/12L) x (274K/272K) = 135.9926471 atm (calculator)

By rule of sig. figs., the final answer should be rounded to an accuracy equal to the 'measured' data value having the least number of sig. figs. This means P₂ ≅ 100 atm based on the given value of P₁ = 90 atm.

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