Answer:
The molarity of ZnCl2 is 1.699 mol/ L.
Explanation:
Balance chemical equation:
Zn(s) + CuCl2(aq) → ZnCl2(aq) + Cu(s)
Given data:
mass of zinc = 30 g
total volume of solution = 270 mL
molarity of ZnCl2 = ?
Solution:
First of all we will calculate the moles of Zn.
molar mass of zinc = 65.38 g/mol
number of moles = mass / molar mass
number of moles = 30 g/ 65.38 g/mol
number of moles = 0.4588 mole
From the balance chemical equation we will compare the moles of Zn and ZnCl2
Zn : ZnCl2
1 : 1
0.4588 : 0.4588
The number of moles of ZnCl2 are 0.4588 mol.
Molarity of ZnCl2:
Total volume of solution is 270 mL. We will convert it into liter.
1 L = 1000 mL
270/1000 = 0.27 L
Molarity = moles of solute / volume of solution in liter
Molarity = 0.4588 mol / 0.27 L
Molarity = 1.699 mol/ L
Answer:
Bacteria decompose rotting plant animal material.
Explanation:
Theres good bacteria, and theres bad bacteria. some helps, and some makes things worse. so really, in some sense all of the above.
Hope that helps.
Answer:
Secondary research
Explanation:
Secondary research involves using already existing data, like what can be found in in books, articles, and electronic databases.
A is wrong. Primary research is the research that you do to obtain new information, as in experiments or in interviews and surveys.
B is wrong. Qualitative research is the gathering of non-numerical data.
C is wrong. Summative research is done at the end of a project to determine its success. It can also point the way to future research projects.
