Is this an addition problem?
Explanation:
Zn=65
Cl2= 35+35=70
65+70=135g
1 mole ZnCl2 = 135g
x mole = 17.5g
17.5g × 1 mole/ 135g= 0.129 moles en 17.5g de ZnCl2
Answer:
3.97 x 10²² molecules
Explanation:
To find the moles, you need to use the Ideal Gas Law:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas constant (0.08206 atm*L/mol*K)
-----> T = temperature (K)
Before you can plug the values into the equation, you need to (1) convert the pressure from torr to atm (by dividing by 760), then (2) convert the volume from mL to L (by dividing by 1000), and then (3) convert the temperature from Celsius to Kelvin (by adding 273).
P = 800.0 torr / 760 = 1.05 atm R = 0.08206 atm*L/mol*K
V = 1500 mL / 1000 = 1.5 L T = 19.0 °C + 273 = 292 K
n = ? moles
PV = nRT
(1.05 atm)(1.5 L) = n(0.08206 atm*L/mol*K)(292 K)
1.579 = n(23.96)
0.0659 = moles
Now, you need to convert moles to molecules using Avogadro's Number.
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
0.0659 moles 6.022 x 10²³ molecules
------------------------ x ------------------------------------- = 3.97 x 10²² molecules
1 mole
Ca=40g
P=31g
Ca3=120g
P2=62g
Ca3P2=182g
Ca3/Ca3p2=120/182=0.6593=approximately 65.93%