<h3>
Answer:</h3>
5.89%
<h3>
Explanation:</h3>
We are given;
- Mass of the solute, LiOH as 40.1 g
- Mass of the solvent, H₂O as 681 g
We are required to calculate the mass percent composition of solution;
- But; How do we calculate the mass percent composition of a solution?
- We use the formula;
- Mass composition of a solution = (Mass of solute/mass of solution) 100%
Mass Percent = (40.1 g/681 g)× 100%
= 5.888 %
= 5.89%
Therefore, the mass percent composition of the solution is 5.89%
Answer:
D.
Explanation:
It pushes the experimental results one way or another. Less reliable.
Answer:To speed up the rate of hydrogen production
Explanation:
In the preparation of Hydrogen from the action of dilute acid on zinc metal, few drops of Copper(II)tetraoxosulphate(VI) solution is added to speed up the rate of production.
The hydrogen produced is shown in the equation below
Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
Thus, Copper(II)tetraoxosulphate(VI) solution, a catalyst is used to speed up hydrogen production.
a) (10.12 g salt) x [(1 mole salt)/(277.85 g salt)] x [(1)/(2.000 L soln)] = 0.0182 M
b) (0.0182 M) x [(1 mole Mg2+)/(1 mole salt)] = 0.0182 M
c) (0.0182 M) x [(3 moles Cl-)/(1 mole salt)] = 0.0546 M
d) [(10.12 g salt)/(2000 mL)] x 100% = 0.506% (w/v)
e) (0.0546 M Cl-)(25.0 mL soln) = 1.36 mmoles Cl-
f) [(0.0182 moles K+) / (1.000 L)] x [(39.10 g K+)/(1 mole K+)] x [(1 L soln)/(1000 g soln)] x (1x10^6) = 712 ppm
Answer:
Single Replacement
Explanation:
The oxygen switches from a bond with iron to a bond with carbon.
