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serg [7]
3 years ago
15

Arrange these elements according to atomic Pb Si C Sn Ge

Chemistry
1 answer:
choli [55]3 years ago
5 0
........C<Si<Ge<Sn<Pb
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The standard heat of combustion of ethanol, C2H5OH, is 1372 kJ/mol ethanol. How much heat (in kJ) would be liberated by complete
Ivanshal [37]

Answer:

The correct answer is 596.5 kJ.

Explanation:

The mass of ethanol or C2H5OH mentioned in the question is 20 gm.  

The molar mass of ethanol is 46 g/mol.  

The moles of the compound can be determined by using the formula,  

n = weight of the compound/molar mass

= 20/46 = 0.435 moles

It is mentioned in the question that standard heat of combustion of ethanol is 1372 kJ/mole, that is, one mole of ethanol is producing 1372 kilojoules of energy at the time of combustion.  

Therefore, the energy liberated by completely burning the 20 grams of ethanol is 0.435*1372 = 596.5 kJ.  

4 0
3 years ago
A scientist observes that an unknown solution turns blue Litmus paper red and reacts with zinc to produce hydrogen gas. Which of
Tatiana [17]
The answer is B: an acid
7 0
3 years ago
This is my cookie &gt;:( you cannot have it
Fofino [41]
Hmm, welll I think it’s heterogeneous
6 0
3 years ago
Can someone write a hypothesis for this: Cigarette smoking increases the risk of lung cancer
Sholpan [36]

Answer: I believe/don't believe that smoking increases the risk of lung cancer because...(add your three reasons if writing an essay)

Explanation:

Since a hypothesis is basically your inference, these hypothesis can vary.

:) Hope this helped

6 0
4 years ago
Read 2 more answers
The​ half-life of the radioactive element unobtanium dash 53 is 20 seconds. if 32 grams of unobtanium dash 53 are initially​ pre
Lelu [443]
when the half-life is the amount of time which the radioactive isotopes need to

be in half.

So when w start with 32 g of unobtanium 53 so :

1- after 20 sec the number of grams remain = 32/2

                                                       = 16 g

2- and after 40 sec the number of grams remain

16 g will cut in half:

= 16 / 2 

= 8 g

3- and after 60 sec the number of grams remain

8 g will cut in half:

= 8g /2

= 4 g

4- and after 80 sec the number of grams remain

4 g will cut in half:

= 4 g /2

 = 2 g

5-after 100 sec the number of grams remain

2 g will cut in half :

     = 2g /2 

     = 0 g

after 100 sec there are no grams remain
6 0
3 years ago
Read 2 more answers
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