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3 years ago

5

Consider an ideal gas enclosed in a 1.00 L container at an internal pressure of 24.0 atm. Calculate the work, w , if the gas exp

ands against a constant external pressure of 1.00 atm to a final volume of 24.0 L.

1 answer:

iVinArrow [24]3 years ago

4 0

W = -P * delta V = - (1.00 atm)*(24.0 L - 1.00 L) = -23 L*atm (101.3 J/1 L*atm) = -233 J

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An unknown compound contains only carbon, hydrogen, and oxygen (CxHyOz). Combustion of 6.00 g of this compound produced 8.80 g o

cricket20 [7]

Answer:

There were 0.20 moles Carbon in the original sample

There were 0.40 moles hydrogen in the original sample

Explanation:

Step 1: The balanced equation

CxHyOz + O2 → CO2 + H2O

Step 2: Data given

mass of the unknown compound = 6.00 g

mass of carbon dioxide produced = 8.80 g

mass of water produced = 3.60 g

Molar mass of Carbon = 12.01 g/mole

Molar mass of Hydrygen = 1.01 g/mole ; 2.02 for H2

Molar mass of Oxygen = 16 g/mole

Molar mass of CO2 = 44.01 g/mole

Molar mass of H2O = 18.02 g/mole

Step 3: Calculate mass

8.80 g CO2 * 12.01 g/mole / 44.01 g/mole = 2.40 g carbon

3.60 g H2O * 2.02 g/mole / 18.02 g/mole = 0.404 g hydrogen

6.00 g total - 2.40 g carbon - 0.404 g hydrogen = 3.196 g oxygen

Step 4: Calculate number of moles

moles = mass / Molar mass

Mass of Carbon = 2.40g / 12.01 g/mole = 0.20 mole Carbon

Mass of hydrogen = 0.40 g / 1.01 g/mole = 0.40 mole Hydrogen

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3 years ago

Ocean water contains 3.5 nacl by mass. what mass of ocean water in grams contains 45.8 g of nacl

Romashka-Z-Leto [24]

Mass percentage of sodium chloride(NaCl) in ocean waters = 3.5 %

That means 3.5 g sodium chloride(NaCl) is present for every 100 g of ocean water.

The given mass of sodium chloride(NaCl) is 45.8 g

Calculating the mass of ocean waters that would contain 45.8 g sodium chloride(NaCl):

$45.8 g NaCl *\frac{100g ocean water}{3.5g NaCl}$

= 1309 g ocean water

Therefore, 45.8 g sodium chloride is present in 1309 g ocean water.

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4 years ago

calculate density of a rectangular solid, which has a mass of 25.71 g. It is 2.30 cm long, 4.01 cm wide and 1.82 cm high.

Levart [38]

Density is a property of the substances that is obtained by dividing its mass by the volume. For a rectangular solid, the volume may be solved by the following equation,

V = L x W x H

Substituting the given values for the dimension,

V = (2.30 cm) x (4.01 cm) x (1.82 cm) = 16.78786 cm³

Calculating for the density,

Density = mass / volume

Density = 25.71 cm / <span>16.78786 cm³ = 1.53 grams per cm</span>³

Thus, the density of the given solid is approximately 1.53 grams per cm³.

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3 years ago

7. DNA is essential to living organisms because it O is a spiral helix can prevent disease O carries the genetic code O can brea

dsp73

Answer: DNA is essential...because it carries the genetic code.

Explanation:

Although the other statements are true about DNA, it's a spiral helix and can break apart, its main function is that it contains the genetic code for organisms.

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Explanation:

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3 years ago

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