Answer:
93,32 % (w/w)
Explanation:
The Ca²⁺ of CaCO₃ was completely precipitate to CaC₂O₄ that results in H₂C₂O₄. The titration of this one is:
3H₂C₂O₄ + 2H⁺ + MnO₄⁻ → Mn²⁺ + 4H₂O + 6CO₂
As you required 35,62mL of 0,1092M MnO₄⁻, the moles of H₂C₂O₄ are:
0,03562L×
=
3,890x10⁻³mol of MnO₄⁻×
= <em>0,01167 mol of H₂C₂O₄</em>
The number of moles of CaCO₃ are the same number of moles of H₂C₂O₄ because every Ca²⁺ was converted in CaC₂O₄ that was converted in H₂C₂O₄. That means: <em>0,01167 mol of CaCO₃</em>
0,01167 mol of CaCO₃ are:
0,01167 mol of CaCO₃×
= <em>1,168 g of CaCO₃</em>
As the mass of the initial mixture is 1,2516 g, the percentage by weight of CaCO₃ is:
×100 = <em>93,32 % (w/w)</em>
I hope it helps!
The statements that are true from the information contained in the question is;
Geologists, biologists, and physicists are only able to gather data through laboratory experiments.
Laboratory experiments are a useful form of scientific investigation in many different fields of science.
<h3>What is an experiment?</h3>
The term experiment refers to the manner in which information could be obtained. We know that we are able to arrive at new knowledge in science by conducting carefully controlled experiments. In this experiment, there must be a dependent variable as well as an independent variable.
The independent variable is the variable that we are able to manipulate in the course of the experiment while the results that we obtain when we manipulate the independent variable affects the values of the dependent variable.
Hence, the statements that are true from the information contained in the question is;
Geologists, biologists, and physicists are only able to gather data through laboratory experiments.
Laboratory experiments are a useful form of scientific investigation in many different fields of science.
Learn kore about experiments:brainly.com/question/11256472
#SPJ1
population is the number of species living in a given area if this is regarding biology or earth studies :)
