Explanation:
The cations and anions are locked tightly into place because of the attraction of their opposite charges - as a result, it's difficult to move the ions and the material is very hard.
Now, if i remember this correctly, since i havent had a chemistry class in over 6 or so years
first you want the mass of baking powder in SI units,
why? -- well because molar mass unit conversions are generally in grams per mole
now, 1 oz = 28.3495 grams
now, assuming the "reactants" are the sodium ion and the hydrogen carbonate ion, you need to determine how many components of each will create one component of baking powder
well, if you look at the chemical compound, it requires one Na+ and one HCO3 -
hence the conversion would be 1 mol Na+ + 1 mol HCO3- ->1 mol NaHCO3
now, the big question is
I have 6oz of NaHCO3, but how many moles is that equal to?
now this is where molar mass is required (if you dont know what a mole is, i suggest looking it up, it has to do with a number of atoms in order to get a specific value)
now, the atomic weight of a sodium ion is 23 au
therefore the Molar mass of a sodium ion is 23 g/mol
the atomic weight of HCO3 is 61 au (i think)
hence the molar mass (MM) is 61 g/mol
the atomic weight of NaHCO3 is 84 au
hence the MM of NaHCO3 is 84 g/mol
now going back to the balanced equations
1 mol Na+ + 1 mol HCO3- ->1 mol NaHCO3
1 +1 ->1
but if we multiply each mol by its respective molar mass, we get
23 g Na+ + 61g HCO3- -> 84g NaHCO3
from here, if you wanted to find the amount of each "reactant" in oz,
its just a bunch of proportions
Answer is: 0,327 g/l.
<span>Ideal gas law: pV = nRT.
</span><span>V - volume, the amount of space occupied by the gas.
</span><span>p - pressure ,1 atm = 760 torr = 760 mmHg.
</span><span>n - amount of substance.
</span>T - temperature, 273 K = 0°<span>C. T = 25 + 273 = 298K.
</span>R - ideal gas constant,<span> R = 0,08206 L</span>·atm/mol·K<span>.
</span>d(He) = M·p ÷ R·T.
d - density.
M - molar mass.
d(He) = 4g/mol · 2atm ÷ 298K · 0,08206 L·atm/mol·K = 0,327 g/l.
Answer:
All atoms of the same element have the same number of protons
Explanation:
All atoms of the same element have the same number of protons. The atoms are formed by protons, neutrons (both located in the nucleus) and electrons located on the outside. The number Z characterizes each element (corresponds to the number of protons located in the nucleus, which coincides with the number of electrons). The number A corresponds to the sum of protons and neutrons of an element (it varies in isotopes, since the number of neutrons varies).