There are 2.71*10^24 atoms of oxygen.
1st) It is necessary to calculate the amount of oxygen in 1.50mol of sodium carbonate (Na2CO3).
We know that 1 mole of sodium carbonate has 3 moles of oxygen, so to calculate the moles of Oxygen in 1.50 moles of Na2CO3 we can use a mathematical Rule of Three:
Now we know that there are 4.5 moles of oxygen in 1.50 moles of sodium carbonate.
2nd) Finally, we can calculate the atoms of oxygen using the Avogadro's number (6.022*10^23 atoms/mol):
So, there are 2.71*10^24 atoms of oxygen in 1.50 mol of sodium carbonate.
A. I think the water may either rise up or it could leak out into the pie pan.
B. The air pressure would increase inside the glass, because you're adding a large amount of air into it.
Answer:
Lead
Explanation:
Lead (Pb) has atomic number 82
Ex Polonium (Po) has atomic number 84 and mass number 212
Compare the density of the rubber to water. If it is less that 1 g/mL then it floats in the water.
You must compare density in the same units. So convert to g/mL
The rubber does not float in water.
Answer:
20.4 grams Zn
Explanation:
To find the mass, you first need to find the moles. This can be found using the Ideal Gas Law equation:
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 convert Celsius to Kelvin.
P = 0.980 atm R = 0.08206 atm*L/mol*K
V = 7.80 L T = 25.0 °C + 273.15 = 298.15 K
n = ? moles
PV = nRT
(0.980 atm)(7.80 L) = n(0.08206 atm*L/mol*K)(298.15 K)
7.644 = n(24.466)
0.312 moles = n
Now that you have the number of moles, you can convert it to grams using the atomic mass of zinc. The final answer should have 3 sig figs to match the sig figs in the given values.
Atomic Mass (Zn): 65.380 g/mol
0.312 moles Zn 65.380 grams
------------------------- x ------------------------- = 20.4 grams Zn
1 mole
