Answer:
n of krypton = 1.23 mol.
The no. of moles will not be changed, if the gas is either argon or krypton.
Explanation:
- The no. of moles of a gas (n) can be calculated by the general gas law of ideal gases: <em>PV = nRT</em>,
Where, P is the pressure of the gas in atm (P = 6.0 atm).
V is the volume of the gas container in L (V = 5.0 L).
n is the no. of moles of the gas.
R is the general gas constant (R = 0.082 L.atm/mol.K).
T is the temperature of the gas in K (T = 25.0°C + 273 = 298.0 K).
<em>∴ n = PV/RT </em>= (6.0 atm)(5.0 L)/(0.082 L.atm/mol.K)(298.0 K) = 1.228 mol = <em>1.23 mol.</em>
The no. of moles will not be changed, if the gas is either argon or krypton because it does not depend on the type of the gas.
7.20594 x 10^20
First you must determine how many moles of P3O5 you have. This is done by using the formula
Number of moles (n) = mass in grams of substance (m) /divided by/ Molar mass (M) [this is the sum of the atomic mass of all atoms in the compound]
n = 0.170 / P (31 x 2) + O (16 x 5)
n = 0.170 / 142
n = 0.001197 moles
Then you use avagadros number 6.02 x10^23 this is the number of atoms in one mole of any substance. Since you have 0.001197 moles you multiply the number of moles by avagadros number
0.001197 x (6.02 x 10^23)
= 7.20594 x 10^20 atoms
the second options
the number of protons and electrons found in that element