Explanation:
The ionic strength of a solution, I, is defined as
I=1/2 Σ m_i z_i^2
Where m_i is the concentration of the ion, and z_i is the charge of the ion.
For 1 M NaCl solution, Ionic strength I = ½ (1*12 + 1*12) = 1.00;
For, 1 M (NH4)2SO4, concentration of [NH4] = 2 M and [SO4] = 1 M;
I = ½ (2*12 + 1*22) = 3.00;
so ionic strength of 1 M (NH4)2SO4 is different, therefore it is a serious error.
Short answer: 27-13=14 neutrons. Long answer: This is because the atomic number tells you the number of protons and the atomic mass is telling you the overall mass of the atom. The atomic number is important because it distinguishes specific atoms and their locations on the periodic table. Protons have a +1 charge and electrons have a negative charge. On the periodic table, all atoms are neutral this means 0 net charge per atom. That also means protons must equal electrons in a 1:1 ratio because electrons provide a -1 charge. Roughly speaking, protons and neutrons way around 1 amu where electrons weigh a lot less. Why is all this important? It’s important because this should give you an idea as to why you can get the number of neutrons by subtracting the atomic mass by the atomic number.
Answer:
Precipitate
Explanation:
Precipitation is actually a chemical reaction that occurs when a solid form is produced from a solution. The solid form is called the precipitate if precipitation occurs in a liquid solution. Precipitates formed are generally, insoluble. This type of reaction can be used to remove salts from a solution, like in the process of purification.
<span>12.4 g
First, calculate the molar masses by looking up the atomic weights of all involved elements.
Atomic weight manganese = 54.938044
Atomic weight oxygen = 15.999
Atomic weight aluminium = 26.981539
Molar mass MnO2 = 54.938044 + 2 * 15.999 = 86.936044 g/mol
Now determine the number of moles of MnO2 we have
30.0 g / 86.936044 g/mol = 0.345081265 mol
Looking at the balanced equation
3MnO2+4Al→3Mn+2Al2O3
it's obvious that for every 3 moles of MnO2, it takes 4 moles of Al. So
0.345081265 mol / 3 * 4 = 0.460108353 mol
So we need 0.460108353 moles of Al to perform the reaction. Now multiply by the atomic weight of aluminum.
0.460108353 mol * 26.981539 g/mol = 12.41443146 g
Finally, round to 3 significant figures, giving 12.4 g</span>
Answer:
When a solid turns directly to a gas this is called sublimation. From the graph it can be seen if the pressure is raised to ~5 atm as the CO2 warms up, it will pass through its triple point.
Explanation: