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2 years ago

A substance composed of two or more elements chemically combined in a definite, fixed proportion by mass is:_________

1 answer:

6 0

A substance composed of two or more elements chemically combined in a definite, fixed proportion by mass is a Compound

A compound is a fabric composed of two or greater components. Water, carbon dioxide and desk salt are a few examples of compounds.

Compound A substance including atoms or ions of two or extra extraordinary factors in precise proportions joined with the aid of chemical bonds into a molecule. The factors can not be separated by means of bodily approach. Water, as an instance, is a compound having hydrogen atoms and one oxygen atom according to molecule.

Milk isn't compound. A compound is an entity which includes or greater distinctive atoms associating with chemical bonds. Milk is an emulsion or colloid of fats globules within a water-primarily based fluid that consists of dissolved carbohydrates and protein aggregates with minerals.

A compound contains atoms of various elements chemically blended together in a fixed ratio. An detail is a pure chemical substance made of same type of atom. Composition. Compounds include one-of-a-kind factors in a fixed ratio arranged in a described manner via chemical bonds.

Compounds shape as a result of chemical reactions. The factors in compounds are held together with the aid of chemical bonds. A chemical bond is a pressure of appeal among atoms or ions that proportion or switch valence electrons. Water is an instance of a commonplace chemical compound.

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The second level has s and p orbitals, the s orbital holds two electrons and all three p orbitals also hold two each for a total of eight electrons in the second energy level.

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3 years ago

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2 years ago

If nicotine has a molar mass of 160±5g/mol , what is its molecular formula?

navik [9.2K]

Answer:

C10H14N2

Explanation:

I don't believe one can deduce the molecular formula from just it's molar mass. There are too many possible combinations of elements that could add to the same mass. This is the correct formula for nicotine, taken from known information, not from an analysis of the molar mass alone. One can confirm the molar mass is in the correct range:

C10: 10*12 = 120

H14: 14*1 = 14

N2: 2*14 = <u> 28</u>

Total = 162 which is 160±5g/mol

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3 years ago

Give the percent yield when 162.8 g of CO2 are formed from the reaction of excess amount of C8H18 and with 218.0 grams of O2. (2

katen-ka-za [31]

Percent yield is 23.11 % when 162.8 g of CO2 are formed from the reaction of excess amount of C8H18 and with 218.0 grams of O2.

Explanation:

Balanced equation for the chemical reaction:

2C8H18 + 25O2 → 16CO2 + 18H2O

data given:

CO2 formed (actual yield) = 162.8 grams

mass of oxygen = 218 grams

16 moles of CO2 formed when 5 moles of oxygen reacted

3.6 moles of CO2 formed when 6.8 moles of oxygen reacted.

In the reaction 16 moles of CO2 will have 44.01 x 16

theoretical yield of CO2 = 704.16 grams

percent yield = $\frac{actual yield}{theoritical yield}$ x100

putting the values in the above equation

percent yield = $\frac{162.8}{704.16}$ x 100

= 0.23 x 100

= 23.11 %

Percent yield is 23.11 %.

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3 years ago