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ANEK [815]
4 years ago
14

What is the density of sample X? ​

Chemistry
1 answer:
lana [24]4 years ago
6 0

Answer:

5ml

Explanation:

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If 40 grams of pentane are burned, how many grams of oxygen are needed ?
Helga [31]
1) Molar mass C5H12= 5*12 +1 *12=60+12=72 g/mol
2) 40g C5H12 * 1 mol C5H12/72 g C5H12 = 40/72 mol C5H12
 3)                              C5H12 + 8O2 ------> 5CO2 + 6H2O
by reaction                 1 mol      8 mol
from problem             40/72 mol  x mol

x=(40/72) * 8/1=(40*8)/72=(40)/9 mol O2
4) M(O2)=2*16 g/mol =32 g/mol
5) (40)/9 mol O2 *(32 g O2/ 1 mol )=(40 * 32)/9 =142.2 g O2


4 0
3 years ago
Recording station x has determined that the epicenter of a recent earthquake was 250 km away. no information is available yet fr
KatRina [158]
The epicenter was located somewhere on a circle centered at Recording station X, with a radius of 250 km.<span>
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7 0
3 years ago
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The weight of the body in the air is .... the weight of the submerged body
stira [4]

Answer:

the correct answer is option 'b': More than

Explanation:

The 2 situations are represented in the attached figures below

When an object is placed in air it is acted upon by force of gravity of earth which is measured as weight of the object.

While as when any object is submerged partially or completely in any fluid the fluid exerts a force in upward direction and this force is known as force of buoyancy and it's magnitude is given by Archimedes law as equal to the weight of the fluid that the body displaces, hence the effective force in the downward direction direction thus the apparent weight of the object in water decreases.

4 0
3 years ago
PLEASE HELP!!!!!!!!!!!!
Nikitich [7]

Answer:

1 : NA = 1    |      2 : N = 2  |     3 :  

N = 1          |       O = 5     |

O = 3         |                     |

Explanation:

im sorry but ion know the last one

5 0
3 years ago
PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
mezya [45]
Since Chlorine is in excess, this is a limiting reagent problem.
1) convert 11.50 g Na to g of NaCl using the balanced equation.
2) percent yield = (actual yield)/(potential yield).

.85= (actual yield)/(g from step 1)

Solve for actual yield
5 0
4 years ago
Read 2 more answers
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