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3 years ago

Calculate the density of a material that has a mass of 50.5g and a volume of 14.5cm3.

Chemistry

1 answer:

White raven [17]3 years ago

4 0

Density = mass / volume = 50.5/14.5 = 3.48 $g/cm ^{3}$ .

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Which feature of four different marine fossils makes the fossil organism most similar to the present-day organism with four limb

zvonat [6]

I found the rest of the exercise on the internet and these are the options.
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3 years ago

2 nf3 + 225 kj -> n2 + 3f2 is it exothermic or endothermic

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Due to energy being a reactant instead of a product, the process is endothermic. The system must absorb a quantity of energy before it can react, so it must be an endothermic system.

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3 years ago

Which of the following will stay constant, no matter if the substance is in the solid, liquid, or gas state?

34kurt

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3 0

3 years ago

Suppose that Daniel has a 3.00 3.00 L bottle that contains a mixture of O 2 O2 , N 2 N2 , and CO 2 CO2 under a total pressure of

Alenkinab [10]

Answer:

Partial pressure O₂ → 2.74 atm

Explanation:

Let's analyse the data given:

Volume → 3L

In the bottle there is a mixture of gases that contains, O₂, N₂ and CO₂.

Total pressure is 4.80 atm

Let's apply the Ideal Gases Law to determine the total moles of the mixture

P . V = n . R. T

4.80 atm . 3L = n . 0.082 . 273K

n = 4.80 atm . 3L / 0.082 . 273K → 0.643 moles

We apply the concept of mole fraction:

Mole fraction of a gas X = moles of gas X / Total moles

Mole fraction of a gas X = Partial pressure X / Total pressure

In a mixture, sum of mole fraction of each gas = 1

We determine mole fraction of N₂ → 0.230 / 0.643 = 0.357

We determine mole fraction of CO₂ → 0.350 atm / 4.80 atm = 0.0729

1 - mole fraction N₂ - mole fraction CO₂ = mole fraction O₂

1 - 0.357 - 0.0729 = 0.5701 → mole fraction O₂

We replace in the formula: Mole fraction O₂ = Partial pressure O₂ / 4.80 atm

0.5701 . 4.80 atm = Partial pressure O₂ → 2.74 atm

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2 years ago

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Alenkasestr [34]

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