Hello!
To do this, use the molar mass. This is how much a mole of an atom weighs. A mole is 6.02214076×10²³ atoms.
Molar masses of:
Se: 78.96 g/mol
Cu: 63.546 g/mol
Ba: 137.327 g/mol
Now, the element with the highest molar mass will have the fewest atoms. This is because the element weighs more, so therefore for the same amount of mass, there will be less of the element needed to reach that mass.
Therefore, 10g of Ba would have the fewest number of atoms.
Hope this helps!
I am not positive this is what you want but here lol:
The Earth's surface is about 71 percent water spreading over many oceans, rivers, and lakes. This also includes the droplets of water on the morning grass, the undrained water from the rain, puddles that never evaporated, etc. As this water is heated up by the Sun, its' molecules start to move faster as it turns into gas and evaporates. As it evaporates it rises, however, the cooler temperatures in the high altitude of Earth's atmosphere make it condense into large clouds. When so much water has evaporated and the cloud very dense, gravity brings down the water from the clouds onto the ground in the form of rain. This completes the water cycle as the water will either turn into runoff, stay on the surface of the Earth, or seep into the ground. Then the water evaporates again, and the whole process starts over.
*Hope this helped!! Have a good night/ day wherever you are! : )*
The answer is No. That is the mass of the sealed jar and its contents does not change upon the vaporization of the liquid, as according to the “law of conservation of mass” , the mass remain conserved when no matter is escape, the mass will remain constant and here also as the jar is sealed, no matter is escaped thus no mass change will be there.
To solve this we use the
equation,
M1V1 = M2V2
<span>where M1 is the concentration of the stock solution, V1 is the
volume of the stock solution, M2 is the concentration of the new solution and
V2 is its volume.</span>
4.5 ( V1 ) = 3.0 ( 500 mL )
V1 = 333.33 mL needed of the 4.5 M phosphoric acid
Hope this answers the question. Have a nice day.
