Answer:
C) It depends on the relative molecular masses of X, Y and Z.
Explanation:
Dalton´s law for the partial pressure of an ideal gas in a mixture is given by the relationship :
Pa = Xa Ptotal,
where Xa is the mole fraction of gas A times the total pressure ( Pa + Pb + Pc...)
The mole fraction is, in turn, given by
Xa = mol A / total # moles
Since the moles of a substance is the mass divided by its molecular weight , it follows that answer C) is the correct one.
The are made from star stuffs...
Galaxies are composed of stars, dust, and dark matter, all held together by gravity. Below we discuss galaxy formation, galactic collisions and other facts about these so-called “island universes.” The Milky Way Galaxy is organized into spiral arms of giant stars that illuminate interstellar gas and dust.
Hope that helps........ (◕‿◕✿)
Answer:
Strong acid breaks up into ions
Explanation:
The energy change if 84.0 g of CaO react with excess water is 98KJ of heat is released.
calculation
heat = number of moles x delta H
delta H = - 65.2 Kj/mol
first find the number of moles of CaO reacted
moles = mass/molar mass
the molar mass of CaO = 40 + 16= 56 g/mol
mass = 84 g
moles therefore = 84 g/56 g/mol =1.5 moles
Heat is therefore = 1.5 moles x -65.2 = - 97.8 Kj = -98 Kj
since sign is negative the energy is released
