Explanation:
The pH is larger than 7.
The relationship between pH and pOH is
pH + pOH = 14
if something is base, it's pH is greater than 7.
it's pOH is between 0 and 7.
If you are trying to find the molarity of this solution you first need to find the number of moles of sodium chloride that are present in the 0.5g sample. To do this you need to divide the mass of sodium chloride (0.5g) by its molar mass (58.45g/mol) to get 0.00855mol of sodium chloride. Then you divide the number of moles (0.00855mol) by the volume of solution (0.05L) to get 0.171M (The units for molarity is mol/L). Therefore the solution has a concentration of 0.171M.
I hope this helps. Let me know in the comments if anything was unclear or if you were asking a different question.<span />
A. The concentration is in mol/L
Answer:
2ZnS (s) + 2HCl (aq) → 4ZnCl₂ (aq) + H₂S (g)
Explanation:
The last equation is incorrectly balanced:
2ZnS (s) + 2HCl (aq) → 4ZnCl₂ (aq) + H₂S (g)
In this chemical equation two zinc and sulfur atoms are present in reactant side while in product side four atoms of zinc and one atom of sulfur are present, that's why it is incorrectly balanced.
The other equations:
Na₂CO₃ (s) → Na₂O (s) + CO₂ (g)
It is correctly balanced because two sodium one carbon and three oxygen atoms are present on both side of reaction.
4Al(s) + 3O₂ (g) → 2Al₂O₃ (s)
It is correctly balanced because four aluminium and six oxygen atoms are present in reactant and product side.
Zn (s) + 2HCl (aq) → ZnCl₂(aq) + H₂ (g)
It is correctly balanced because one zinc two chlorine and two hydrogen atoms are present on both side of reaction.
Answer : The chemical formula for the given compound is
Explanation : Given,
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of = 45.43 g
Mass of = 54.57 g
Molar mass of = 18 g/mole
Molar mass of = 129.9 g/mole
To formulate the chemical formula, we need to follow some steps:
Step 1: Converting the given masses into moles.
Moles of water =
Moles of =
Step 2: Calculating the mole ratio of the given molecule.
For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.4201 moles.
For =
For Carbon =
Step 3: Taking the mole ratio as their subscripts.
The ratio of = 1 : 6
The chemical formula for the given compound is
Hence, the chemical formula for the given compound is