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wel
3 years ago
11

Can you please answer Question 9 please

Chemistry
1 answer:
MissTica3 years ago
6 0
The answer is C because I kno
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The cube has a mass of 72.9 g.<br><br> What is its density in g/cm3? <br><br> What substance is it?
sashaice [31]
If the cube is 3 cm on each side, then it has a volume of 27 cm^3 (3 x 3 x 3). Density is mass divided by volume, so its density is 72.9/27 = 2.7 g/cm^3. 

<span>Going by the density, the cube is made of Aluminium - density is a fairly unique quantity</span>
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3 years ago
g Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 2.71 g of ethane i
Kamila [148]

Answer:

6.05g

Explanation:

The reaction is given as;

Ethane + oxygen --> Carbon dioxide + water

2C2H6 + 7O2 --> 4CO2 + 6H2O

From the reaction above;

2 mol of ethane reacts with 7 mol of oxygen.

To proceed, we have to obtain the limiting reagent,

2,71g of ethane;

Number of moles = Mass / molar mass = 2.71 / 30 = 0.0903 mol

3.8g of oxygen;

Number of moles = Mass / molar mass = 3.8 / 16 = 0.2375 mol

If 0.0903 moles of ethane was used, it would require;

2 = 7

0.0903 = x

x = 0.31605 mol of oxygen needed

This means that oxygen is our limiting reagent.

From the reaction,

7 mol of oxygen yields 4 mol of carbon dioxide

0.2375 yields x?

7 = 4

0.2375 = x

x = 0.1357

Mass = Number of moles * Molar mass = 0.1357 * 44 = 6.05g

8 0
3 years ago
Imagine the earth's hydrosphere began to dry up and disappear. all of the following would be affected except
RoseWind [281]
Answer most suited would be A
6 0
3 years ago
Read 2 more answers
Can you please tell me the steps to figure how the answers to number 2?
Evgesh-ka [11]

Answer:

its a trick yo have to add it all

Explanation:

7 0
3 years ago
QUIZ 3: GOLDEN YEARS TO BOHR MODEL quizleConsider the two electron arrangements for neutral atoms A and B. What is the atomic nu
ELEN [110]

Answer:

11

Explanation:

trust me

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2 years ago
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