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3 years ago

Potassium has an atomic number of 19 it often forms and ion by losing 1 electron how many electrons would the ion have

Chemistry

1 answer:

DochEvi [55]3 years ago

5 0

Answer: 18

Explanation:

Since there are 19 protons and 19 electrons, by losing one electron, potassium would then have 18 electrons. Hope this helps!

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ruslelena [56]

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3 years ago

Read 2 more answers

KNO3(s) --> K+(aq) + NO3-(aq)This reaction was carried out in a Styrofoam insulated calorimeter and the following data were r

nataly862011 [7]

Answer:

Equation correctly showing the heat of solution

$KNO_3(s)+35.2 kJ \rightarrow K^+(aq) + NO_{3}^-(aq)$

Explanation:

Mass of aqueous solution = m = 100 g

Specific heat of solution = c = 4.18 J/gºC

Change in temperature = $\Delta T=T_f-T_i$

ΔT = 21.6ºC - 30.0ºC = -8.4ºC

Heat lost by the solution = Q

$Q = mc\Delta T$

$Q=100 g\times 4.18 J/g^oC\times (-8.4^oC)$

Q = -3,511.2 J ≈ -3.51 kJ

Heat absorbed by potassium nitrate when solution in formed; Q'

Q' = -Q = 3.51 kJ

Moles of potassium nitrate , n= $\frac{10.1 g}{101 g/mol}=0.1 mol$

$KNO_3(s)\rightarrow K^+(aq) + NO_{3}^-(aq)$

The heat of solution =

$\frac{Q'}{n}=\frac{3.5112 kJ}{0.1 mol}=35.1 kJ/mol$

So, the equation correctly showing the heat of solution

$KNO_3(s)+35.2 kJ \rightarrow K^+(aq) + NO_{3}^-(aq)$

4 0

4 years ago

Grams. Number only, rounded to the One mole of silver weighs hundredths place (.01) *Y

jek_recluse [69]

Answer:

107.87 grams

Explanation:

One mole of silver weighs 107.87 grams .

7 0

3 years ago

The graph above represents an object moving with a __________________. A) constant velocity B) constant acceleration C) constant

Ann [662]

Answer: I think its C or B

Explanation: Hope this was helpful....

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3 years ago

A mixture of He, Ne, and N2 gases has a pressure of 1.943 atm. If the pressures of He and Ne are 0.137 atm and 0.566 atm, respec

Ad libitum [116K]

Answer:

The parcial pressure of N₂ in the mixture is 1.24 atm.

Explanation:

The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

PT = PA + PB

This relationship is due to the assumption that there are no attractive forces between the gases.

In this case:

PT=PHe + PNe + PN₂

You know:

PT= 1.943 atm
PHe= 0.137 atm
PNe= 0.566 atm
PN₂= ?

Replacing:

1.943 atm= 0.137 atm + 0.566 atm + PN₂

Solving:

1.943 atm= 0.703 atm + PN₂

1.943 atm - 0.703 atm= PN₂

1.24 atm= PN₂

The parcial pressure of N₂ in the mixture is 1.24 atm.

4 0

3 years ago