The space inside the jar is a vacuum and there is no waves to carry sound
brainlyest please
CaBr2 is an ionic bond. This is because the calcium gives up an electron to each of the chlorine atoms resulting in the calcium becoming Ca2+ ions...
I assume you mean, how to calculate the moles in a substance from grams.
Firstly, you will need to take into account the mass number of the atoms in the molecular compound.
Say, H2O.
Hydrogen mass = 1.00794
Oxygen mass = 15.9994
I will then have to multiply the atoms by their quantities and combine the molecular compound atoms' mass, respectively.
(2)(1.00794) + (1)(15.9994) = 18.01528.
This is used as the divisor that is divided to grams, to find the moles of a substance.
For example, 10 grams is 10/18.01528 = 0.56 moles
Answer : The correct option is, (A) 0.42 moles
Explanation :
Using ideal gas equation:
where,
P = pressure of gas = 125000 Pa = 125 kPa
conversion used : (1 kPa = 1000 Pa)
V = volume of gas =
conversion used :
T = temperature of gas = 357 K
n = number of moles of gaseous mixture = ?
R = gas constant = 8.314 kPa.L/mol.K
Now put all the given values in the ideal gas equation, we get:
Therefore, the number of moles of an ideal gas is 0.42 mole.