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dimaraw [331]
3 years ago
10

Number one and atom of element x contains 15 electrons and 16neutrons.

Chemistry
2 answers:
Sladkaya [172]3 years ago
8 0

Answer:

a) 30.97

b) 3s² 3p²

I hope it's helps you

Gnesinka [82]3 years ago
6 0

No of protons=No of electrons=15

Mass no:-No of neutrons+No of protons

\\ \tt\longmapsto 15+16=31

Now

It has atomic no 15 hence its Phosphorus(P)

Electronic configuration:-

\\ \tt\longmapsto 1s^22s^22p^63s^23p^3.

  • Valency=3
<h3>Chloride formula:-</h3>

\\ \tt\longmapsto XCl_3

or.

\\ \tt\longmapsto PCl_3

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An object has a mass of 960 g and a volume of 15cm3 what’s the density?
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8 0
2 years ago
An unknown metal forms a soluble compound, M(NO3)2, which then undergoes electrolysis with an applied current of 2.50 amperes. I
frozen [14]

Answer:

The metal is the cathode

The metal is palladium

At the other cathode, the reaction going on is

M(s) ------> M2^+(aq) + 2e

Chlorine can spontaneously react with Pd converting it to Pd^2+

The molar mass of the metal is 106.4 g of M

Explanation:

Given the formula of the compound, M^2+ ion is involved. The equation of the reaction is;

M^2+(aq) + 2e -------------> M(s)

The number of moles of electrons transferred = 2 moles

1 mole of electron = 96500C

And Q= It

Where I= current

t= time taken in seconds

Now;

x g of the metal (its molar mass) is deposited by 2×96500 C

1.87 g of the metal is deposited by (2.50× 22.6×60) C

x = 1.87 × 2×96500/ 2.50 × 22.6 × 60

x= 360910/3390

x= 106.4 g of M

The metal is the cathode

The metal is palladium

At the other cathode, the reaction going on is

M(s) ------> M2^+(aq) + 2e

Chlorine can spontaneously react with Pd converting it to Pd^2+

7 0
4 years ago
10.
kondor19780726 [428]

Answer:

A.  

Explanation:

The leading zeros in c, d, and e are not significant.  There is no zero in b.  Just one left and all it's zeros are significant.

5 0
3 years ago
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