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irina1246 [14]
3 years ago
14

Many scientists say, “There is no such thing as a closed system in the universe.” For example, even an unopened can of soda is a

n open system.
example explains why an unopened can of soda is an open system?
A.The unopened can of soda can become cold if placed in a refrigerator, allowing for heat to transfer between two systems.
B.The mass of the unopened can will eventually disappear.
C.Over time, chemical components of the unopened can of soda will change.
D.The unopened can of soda will become an open system If the can is opened.
Chemistry
1 answer:
tankabanditka [31]3 years ago
7 0
I believe the answer is "A."
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Answer:

m_{HBO_2}=441.8gHBO_2

Explanation:

Hello there!

In this case, since the combustion of B2H6 is:

B_2H_6+3O_2\rightarrow 2HBO_2+2H_2O

Thus, since there is 1:2 mole ratio between the reactant and product, the produced grams of the latter is:

m_{HBO_2}=139.5gB_2H_6*\frac{1molB_2H_6}{27.67gB_2H_6} *\frac{2molHBO_2}{1molB_2H_6} *\frac{43.82gHBO_2}{1molHBO_2}

m_{HBO_2}=441.8gHBO_2

Best regards!

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A compound is found to contain 7.962 % silicon , 20.10 % chlorine , and 71.94 % iodine by mass. to answer the question, enter th
arlik [135]
Empirical   formula  is  calculated   as  follows

calculate  the  moles  of  each  element,  that  is   %  composition/  molar  mass
molar  masses  (  Si=  28.09g/mol ,  Cl=  35.5  g/mol,  I=126.9 g/mol)

moles  of  silicon =  7.962/28.09g/mol=  0.283  moles
moles  of  chlorine =  20.10 / 35.5g/mol =  0.566  moles
moles  of  iodine=  71.94 / 126.9  g/mol=  0.567  moles

divide  each  mole   with  smallest    mole  (0.283)
that  is    silicon =  0.283/0.283= 1 mole
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empirical  formula  is  therefore=  SiCl2I2


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