Answer:
0.007 mol
Explanation:
We can solve this problem using the ideal gas law:
PV = nRT
where P is the total pressure, V is the volume, R the gas constant, T is the temperature and n is the number of moles we are seeking.
Keep in mind that when we collect a gas over water we have to correct for the vapor pressure of water at the temperature in the experiment.
Ptotal = PH₂O + PO₂ ⇒ PO₂ = Ptotal - PH₂O
Since R constant has unit of Latm/Kmol we have to convert to the proper unit the volume and temperature.
P H₂O = 23.8 mmHg x 1 atm/760 mmHg = 0.031 atm
V = 1750 mL x 1 L/ 1000 mL = 0.175 L
T = (25 + 273) K = 298 K
PO₂ = 1 atm - 0.031 atm = 0.969 atm
n = PV/RT = 0.969 atm x 0.1750 L / (0.08205 Latm/Kmol x 298 K)
n = 0.007 mol
Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity.
Answer:
46.784886 amu is the average atomic mass of titanium on that planet.
Explanation:
Fractional abundance of Ti-46 =72.000% = 0.72000
Atomic mass of Ti-46 = 45.95263 amu
Fractional abundance of Ti-48 =14.300% = 0.14300
Atomic mass of Ti-48 = 47.94795 amu
Fractional abundance of Ti-50 =13.700% = 0.13700
Atomic mass of Ti-50 = 49.94479 amu

Average atomic mass of titanium atom:

46.784886 amu is the average atomic mass of titanium on that planet.