3 years ago

An atom of boron has an atomic number of 5 and an atomic mass of 11. the atom contains

Chemistry

1 answer:

kirill [66]3 years ago

8 0

The atom contain 6 neutrons, if that's the question

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PLEASE HELP!!!

Kaylis [27]

I think it comes from Fungi. I'm not 100% sure about that though.

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2 years ago

The electron dot diagram for a neutral atom of chlorine (atomic number 17) is shown below.

sergejj [24]

Answer:

A. 35Cl1-

Explanation:

Chlorine needs 1 more electron to have full octet thus will take 1 electron and possess a -1 charge.

7 0

2 years ago

Two systems with heat capacities 19.9 J mol-1 K-1 and 28.2 ] mol 1 K-1 respectively interact thermally and come to an equilibriu

MAVERICK [17]

Answer : The initial temperature of system 2 is, $19.415^oC$

Explanation :

In this problem we assumed that the total energy of the combined systems remains constant.

$-q_1=q_2$

$m\times c_1\times (T_f-T_1)=-m\times c_2\times (T_f-T_2)$

The mass remains same.

where,

$C_1$ = heat capacity of system 1 = 19.9 J/mole.K

$C_2$ = heat capacity of system 2 = 28.2 J/mole.K

$T_f$ = final temperature of system = $30^oC=273+30=303K$

$T_1$ = initial temperature of system 1 = $45^oC=273+45=318K$

$T_2$ = initial temperature of system 2 = ?

Now put all the given values in the above formula, we get

$-19.9J/mole.K\times (303-318)K=28.2J/mole.K\times (303-T_2)K$

$T_2=292.415K$

$T_2=292.415-273=19.415^oC$

Therefore, the initial temperature of system 2 is, $19.415^oC$

8 0

3 years ago

HELP !! For the principal quantum number n equals 2, we can have sub-levels.

Charra [1.4K]

Answer: d both a and b

Explanation:

6 0

2 years ago

The pH of lemon juice at 298 K is found to be 2.32. What is the concentration of H3O+ ions in the solution?

Vinvika [58]

PH = -log[H₃O⁺]

[H₃O⁺] = 10^-pH
[H₃O⁺] = 10^-2,32
[H₃O⁺] =0,0047863 ≈ 4,79×10×10⁻³ mol/dm³

B) -- 4,79×10⁻³ M

7 0

3 years ago

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