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melomori [17]
3 years ago
9

Arrange the metals used in this experiment (including H2 and Ag) in order of decreasing reactivity (most reactive metal first).

The metals to be included are Ag, Al, Ca, Cu, Fe, H2, Mg, Na, Pb, Sn, and Zn.
Chemistry
1 answer:
LUCKY_DIMON [66]3 years ago
4 0

Explanation:

According to the reactivity series chart, elements from high to lower reactivity are arranged as follows.

    K, Na, Ca, Mg, Al, C, Zn, Fe, Sn, Pb, H, Cu, Ag, Au

So, using this standard reactivity chart of metals we will place the given metals in the order of decreasing reactivity as follows.

     Na > Ca > Mg > Al > Zn > Fe > Sn > Pb > H_{2} > Cu > Ag

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ethylene glycol, commonly used in automobile antifreeze, contains only carbon, hydrogen and oxygen.combustion analysis of a 23.4
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Answer:

Molecular formula of ethylene glycol is C₂H₆O₂.

Explanation:

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mass of water = 20.42 mg

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molar mass of ethylene glycol = 62.0 g / mol

Molecular formula of ethylene glycol = ?

Solution:

percentage of carbon = (33.27 mg/ 23.46 mg) × (12 /44) × 100

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Now we will determine the number of grams atoms of carbon, hydrogen and oxygen.

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No. of gram atoms of hydrogen = 9.67 / 1 = 9.67

No. of gram atoms of oxygen = 52.04 / 16 = 3.25

Atomic ratio:

     C :H :O               3.19/ 3.19    :   9.67 / 3.19   :  3.25 /3.19

     C :H :O                 1 : 3 : 1

Molecular formula:

    Molecular formula = n × (empirical formula)

    n = molar mass of compound / empirical formula mass

    empirical formula mass= 1 × 12 + 3 × 1  + 1 × 16

     empirical formula mass= 12+3 +16 = 31

                  n = 62 g /mol / 31 = 2

         Molecular formula = n × (empirical formula)

         Molecular formula = 2 × (CH₃O)

          Molecular formula = C₂H₆O₂

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