Given :
A chemical compound .
To Find :
Fix the formula for and write the full correct formula.
Solution :
We know, Potassium( K ) and Fluorine( F ) both have a valency of 1 i.e potassium can donate one electron and Fluorine can accept one electron only.
So, the chemical formula is wrong because no element has filled electron.
Therefore, to stabilise the molecule, 1 Potassium atom should make a bond from 1 Fluorine i.e KF ( correct formula ) .
Hence, this is the required solution.
Answer:
Explanation:
The frequency and the wavelength of a wave are related by the equation
where
v is the speed
f is the frequency
is the wavelength
For the sound wave in this problem, we have
f = 634 Hz (frequency)
(wavelength)
Therefore, the speed of the wave is
The speed of sound in air depends on the temperature according to the equation
where T is the temperature.
In this problem, we know the speed, so we can calculate the temperature:
<u>Answer:</u> The mass of water that must be reacted is 56.28 grams.
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
....(1)
Given mass of oxygen = 50 g
Molar mass of oxygen = 32.00 g/mol
Putting values in equation 1, we get:
For the given chemical equation:
By Stoichiometry of the reaction:
1 mole of oxygen is produced when 2 moles of water is reacted.
So, 1.5625 moles of oxygen is produced when = of water is reacted.
To calculate the mass of water, we use equation 1:
Moles of water = 3.125 moles
Molar mass of water = 18.01 g/mol
Putting values in equation 1, we get:
Hence, the mass of water that must be reacted is 56.28 grams.
