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vesna_86 [32]
3 years ago
14

2C2H6 (g) + 7O2 (g) → 4CO2(g) + 6H2O (g) ΔH = -1560 kJ

Chemistry
1 answer:
Alex73 [517]3 years ago
6 0

Answer:

17.77 g

Explanation:

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What does B represent?
Mashutka [201]

Answer: Botanical Acid

Explanation:

8 0
2 years ago
How many core electrons are in a ground state atom of selenium?
Harman [31]
Electrons in an atom can be classified as core electrons and valence electrons. Valence electrons are those electrons which are present in valence shell and participates in bond formation. While, Core electrons are all remaining electrons which are not present in valence shell, hence not take part in bonding.

Atomic number of Selenium (Se) is 34 hence it has 34 electrons with following electronic configuration;

                          1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁴

From electronic configuration it is found that the valence shell is 4, and the number of electrons present in valence shell are 6. So, 

             Core Electrons  =  Total Electrons - Valence Electrons

             Core Electrons  =  34 - 6

             Core Electrons  =  28

Result:
          There are 28 core electrons in Selenium.
3 0
3 years ago
Find mass of 3 moles of water​
EleoNora [17]

Answer:

54 g

Explanation:

1 mole of water = H2O

mass of 1 mole of H2O= mass of h2 + mass of o

= 2× mass of h +mass of o

= 2×1+16 =18 g

1 mole of water = 18g

3moles of water = 18×3g= 54g

6 0
3 years ago
Does the absolute reference system consider a fixed reference system of reference?
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Answer:

The definition of an absolute reference frame would be that fixed reference frame that every observer would rest at all times in his/her state of motion.

Explanation:

6 0
2 years ago
There are<br> naturally occuring elements.
mr_godi [17]
There are 94 naturally occurring elements
6 0
3 years ago
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