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stellarik [79]
4 years ago
8

How many moles are represented by 118g of cobalt? Cobalt had an atomic mass of 58.93amu

Chemistry
1 answer:
skad [1K]4 years ago
5 0
N=m/M
n=118/58.93=2
Answer: 2 moles
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"what is the oxidation number of phosphorus in h2p3o10?"
slava [35]

Answer:

             Oxidation Number of Phosphorous  =  + 6

Explanation:

According to Rules of Assigning Oxidation States;

          i)  The Oxidation State of Hydrogen atom in a compound is assigned as +1 except for Hydrides i.e. NaH and MgH₂ where it is assigned with -1.

          ii) The Oxidation State of Oxygen in a compound is assigned as -2 except for Peroxides where it is given -1 and OF₂ where it is assigned with +1 respectively.

Oxidation State of P in H₂P₃O₁₀;

As over all molecule is neutral we can write it as,

                       H₂P₃O₁₀  =  0

Putting oxidation number of H and O,

                       (+1)₂ + P₃ + (-2)₁₀  =  0

                       (+2) + P₃ + (-20)  =  0

                       + 2 + (P)3 -20  =  0

                       (P)3  =  + 20 - 2

                       (P)3  =  + 18

                       P  =   + 18 ÷ 3

                       P  = + 6

4 0
3 years ago
Need help solving these questions
Anton [14]

Answer:

1) 100

2) 22

3) 39

4) 6

5) 2b + 6

6) 8

7) 4n + 20

Explanation:

If B is the midpoint of AC and C is the midpoint of BD, means that all 3 parts are equal. AB = BC = CD

1) If AB = 50 then AC = AB + BC = 50 +50 = 100

2)if BD = 44 then is CD = 44 - BC ⇔ CD = 44 - 22 = 22

3) if AC = 26 and AC = AB + BC   then each part is 13  

AD = AC + CD = 26 +13 = 39

4)if CD = 6 then  AB = 6 Because all single parts are equal

5) if AC = 4b + 12 then is AB the half of it = 2b +6

6) if AD = 24 then AB = 1/3 of it = 8

7)if BC is 2n + 10 then is AC = 2x BC = 4n + 20

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3 years ago
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Conductance decreased when increase in temperature of conductor



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Which of the following sets represents a pair of isotopes? 14C and 14N 206Pb and 208Pb O2 and O3 32S and 32S2-
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