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pishuonlain [190]
3 years ago
14

An element has 13 protons in its nucleus. What is its atomic number?

Chemistry
2 answers:
Dafna11 [192]3 years ago
6 0

Answer:

The answer is 13.

Explanation:

In an element, proton number is also define as atomic number. So if the element has 13 protons, it's atomic number will be 13.

-BARSIC- [3]3 years ago
6 0
Atom has 13 protons
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The value of Ksp for PbCl2 is 1.6 ×10-5. What is the lowest concentration of Cl-(aq) that would be needed to begin precipitation
Dovator [93]

Answer:

0.04 M is the lowest concentration of chloride ions that would be needed to begin precipitation.

Explanation:

Concentration of lead nitarte = [Pb(NO_3)_2]=0.010 M

Pb(NO_3)_2(aq)\rightleftharpoons Pb^{2+}(aq)+2NO_{3}^{-}(aq0

1 Mole of lead nirate gives 1 mole of lead ion.

Concentration of lead ion in the solution = 1\times 0.010 M= 0.010 M

Pb(Cl)_2(aq)\rightleftharpoons  Pb^{2+}(aq)+2Cl^{-}(aq0

Concentration of chloride ions = [Cl^-]

The value of K_{sp} for [tex]PbCl_2= 1.6\times 10^{-5}

K_{sp}=[Pb^{2+}][Cl^{-}]^2

1.6\times 10^{-5}=0.010 M\times [Cl^{-}]^2

[Cl^-]=0.04 M

0.04 M is the lowest concentration of chloride ions that would be needed to begin precipitation.

3 0
4 years ago
How many moles of O2 would be needed to produce 3.2 moles Fe2O3?
antiseptic1488 [7]

Answer:

0.533 mol O2

Explanation:

4 Fe3O4 + O2 -> 6 Fe2O3

1 mol O2  -> 6 mol Fe2O3

           x   -> 3.2 mol Fe2O3

x = (3.2 mol Fe2O3 * 1 mol O2)/ 6 mol Fe2O3

x= 0.533 mol O2

4 0
4 years ago
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