All categories

3 years ago

Calculate the number of neutrons in potassium-40.

Chemistry

2 answers:

arsen [322]3 years ago

6 0

Potassium electrons=19, protons =electrons. No of neutrons= no of mass - no of protons. 40-19=21.Ans =21 neutrons

dsp733 years ago

5 0

Answer:

21 neutrons

Explanation:

There are 21 neutrons in Pottasium-40

You might be interested in

Which mass of magnesium sulphate will be formed if 12 g of magnesium are reacted with sulphuric acid?

Alinara [238K]

Answer:

magnesium hydrosulphate

4 0

3 years ago

State Boyle's, Charles's, and Gay-Lussac's laws using sentences, then equations

dimaraw [331]

Explanation:

1. Boyle's Law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

$P\propto \frac{1}{V}$ (At constant temperature and number of moles)

$P_1\times {V_1}=P_2\times V_2$

2. Charles' Law states that volume is directly proportional to the temperature of the gas at constant pressure and number of moles.

$V\propto T$ (At constant pressure and number of moles

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

3. Gay Lussac's Law states that tempertaure is directly proportional to the pressure of the gas at constant volume and number of moles of gas

$P\propto T$ (At constant volume and number of moles)

$\frac{V_1}{n_1}=\frac{V_2}{n_2}$

7 0

3 years ago

1. Why were atoms given the name of "atom" which means "unable to be cut?"

alexandr1967 [171]

Answer:

These particles were considered so small that they were unable to be cut

3 0

3 years ago

1. How many moles of oxygen gas are needed to form 21.8 liters of water vapor?

BaLLatris [955]

0.781 moles

Explanation:

We begin by balancing the chemical equation;

O₂ (g) + 2H₂ (g) → 2H₂O (g)

21.8 Liters = 21.8 Kgs

To find how many moles are in 28.1 Kg H₂O;

Molar mass of H₂O = 18 g/mol

28.1/18

= 1.56 moles

The mole ratio between water vapor and oxygen is;

1 : 2

x : 1.56

2x = 1.56

x = 1.56 / 2

x = 0.781

0.781 moles

7 0

3 years ago

Which statement is true of diffusion?

raketka [301]

Answer:

Molecules move from areas of high concentration to areas of low concentration.

4 0

3 years ago

Calculate the number of neutrons in potassium-40￼.

Calculate the number of neutrons in potassium-40.