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3 years ago

How can you tell the difference between a mixture and a pure substance

1 answer:

8 0

Mixtures are combinations of materials that can be separated by in most cases time. For instance, oil and water is a mixture. You can tell this by placing the two chemicals in a container and shaking them. They will mix and look like one substance, however, they will separate into the two liquids after some time is given. Assuming that "pure substance" is a solution, a substance is similar to a mixture, but the materials used in the solution are not separable. Over time the materials in the containing will not separate. I believe this is the answer you are looking for.

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What is the percent by mass of chlorine in NaCi? total mass of element in compound molar mass of compound Use %Element x 100

jekas [21]

What is the percent by mass of chlorine in NaCi? total mass of element in compound molar mass of compound Use %Element x 100

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3 years ago

What quantity of sodium azide in grams is required to fill a 56.0 liters air bag with nitrogen gas at 1.00 atm and exactly 0 °C:

Margarita [4]

Answer:

108.6 g

Explanation:

2NaN₃(s) → 2Na(s) + 3N₂(g)

First we use the PV=nRT formula to calculate the number of nitrogen moles:

P = 1.00 atm

V = 56.0 L

n = ?

R = 0.082 atm·L·mol⁻¹·K⁻¹

T = 0 °C ⇒ 0 + 273.2 = 273.2 K

Inputting the data:

1.00 atm * 56.0 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 273.2 K

n = 2.5 mol

Then we convert 2.5 moles of N₂ into moles of NaN₃, using the stoichiometric coefficients of the balanced reaction:

2.5 mol N₂ * $\frac{2molNaN_3}{3molN_2}$ = 1.67 mol NaN₃

Finally we convert 1.67 moles of NaN₃ into grams, using its molar mass:

1.67 mol * 65 g/mol = 108.6 g

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3 years ago

Can radiation be recycled

Elenna [48]

they usually get decomposed

3 0

3 years ago

A compound has a molar mass of 90 grams per mole and the empirical formula CH2O. What is the molecular formula of this compound?

Ira Lisetskai [31]

CH2O = 12 + 2 + 16 = 30
90 /30 = 3
3 x (CH2O) = C3H6O3

8 0

3 years ago

Read 2 more answers

gasoline is separated from crude oil by heating it until it reaches it's boiling point. which separation method is used?

Orlov [11]

Answer:

Fractional distillation

Explanation:

The separation of gasoline from crude oil by heating until it reaches its boiling point is a separation technique called fractional distillation.

It is the separation of a mixture, such as crude oil into their respective fractions.
This is achieved due to the differences in boiling point between the constituent fractions in the mixture.
As the boiling point of a fraction is reached, it distills out from the column.

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3 years ago