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2 years ago

How many moles of oxygen are prosent in 169 of oxygen gas?

Chemistry

2 answers:

pashok25 [27]2 years ago

8 0

Answer:

number of moles = mass / molar mass

since oxygen is diatomic

molar mass =16*2

number of moles= 169/ 16 *2

number of moles= 169/32

number of moles= 5.28125

slamgirl [31]2 years ago

6 0

Answer:

Number of moles=Mass/ Molar Mass 169g÷32g/mol= 5.281 mol

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the molar enthalpy of formation of carbondioxide is -393kjmol. calculate the heat released by the burning of 0.327g of carbon to

Arte-miy333 [17]

This is equivalent to having a standard enthalpy change of reaction equal to 10.611 kJ

<u>Explanation</u>:

The standard enthalpy change of reaction, Δ H ∘ , is given to you in kilojoules per mole, which means that it corresponds to the formation of one mole of carbon dioxide.

C (s] + O 2(g] → CO 2(g]

Remember, a negative enthalpy change of reaction tells you that heat is being given off, i.e. the reaction is exothermic.

First to convert grams of carbon into moles,

use carbon's molar mass(12.011 g).

Moles of C = mass in gram / molar mass

= 0.327 g / 12.011 g

Moles of C = 0.027 moles

Now, in order to determine how much heat is released by burning of 0.027 moles of carbon to form carbon-dioxide.

= 0.027 moles C $\times$ 393 kJ

Heat released = 10.611 kJ.

So, when 0.027 moles of carbon react with enough oxygen gas, the reaction will give off 10.611 kJ of heat.

This is equivalent to having a standard enthalpy change of reaction equal to 10.611 kJ

7 0

3 years ago

ASAP help with these please.

german

Answer:

1. See explanation below

2. Density

3. Masses

Explanation:

1. Your picture is a bit too small to see the values but maybe this will help you.

To determine the maximum maximum mass in grams that triple beam balance can measure all you have to do is add up the maximum of each beam. So all you need to do is see the value at the last notch of each beam.

However, if you are referring to the picture that is attached in the bottom: The answer would be 610g. Because the last notches of each beam are as follows:

100 g

500 g

10 g

So we add that we get 610g.

2. density can be computed using the formula:

D = M/V

where:

D = density

M = mass

V = volume

As you can see in the both figures A and B measure 20 g, this means that their masses are the same. The density of objects can be different when either their masses, or their volumes are different. So even if they have the same mass, they can have different densities because they have different volumes.

3. Force of gravitational attraction between two objects is dependent on the masses of the two objects and the distance. The larger the mass, the stronger the gravitational force of attraction. This means that they have a direct relationship. Now when it comes to distance, the further apart they are the weaker the gravitational force of attraction, or in other words, they are indirectly related.