Answer:
The answer to your question is below
Explanation:
Data
mass of CaCO₃ = 155 g
mass of HCl = 250 g
mass of CaCl₂ = 142 g
reactants = CaCO₃ + HCl
products = CaCl₂ + CO₂ + H₂O
1.- Balanced chemical reaction
CaCO₃ + 2HCl ⇒ CaCl₂ + CO₂ + H₂O
2.- Limiting reactant
molar mass of CaCO₃ = 40 + 12 + 48 = 100 g
molar mass of HCl = 2[1 + 35.5 ] = 73 g
theoretical proportion CaCO₃ /HCl = 100 / 73 = 1.37
experimental proportion CaCO₃ /HCl = 155 / 250 = 0.62
As the experimental proportion was lower than the theoretical proportion the limiting reactant is CaCO₃
3.-
Calculate the molar mass of CaCl₂
CaCl₂ = 40 + 71 = 111 g
100 g of CaCO₃ ------------------ 111 g of CaCl₂
155 g of CaCO₃ ----------------- x
x = (155 x 111) / 100
x = 17205 / 100
x = 172.05 g of CaCl₂
4.- percent yield
Percent yield = 142 / 172.05 x 100 = 82.5 %
5.- Excess reactant
100 g of CaCO₃ -------------------- 73 g of HCl
155 g of caCO₃ ------------------- x
x = (155 x 73)/100
x = 133.15 g
Mass of HCl = 250 - 133.15
= 136.9 g
Answer:
The independent variable (IV) is the characteristic of a psychology experiment that is manipulated or changed by researchers, not by other variables in the experiment.
For example, in an experiment about the effect of nutrients on crop growth: The independent variable is the amount of nutrients added to the crop field. The dependent variable is the biomass of the crops at harvest time.
Therefore : 3. the variable that responds to what the scientist changes in an experiment
1. It is made out of Iron. 2. It's the hottest layer of the Earth, like super super hot.
The rate change if(c) [H⁺] is changed to 0.0001 M is 0.01.
<h3>What is an acidic solution?</h3>
A solution with a pH lower than 7 is said to be acidic. Acidic solutions have pH values lower than 7. Fructose is created when glucose is broken down.
Sucrose + H+ = fructose + glucose
The rate law of reaction is R = k [H+] [sucorse]
H+ = 0.01 M
[sucrose] = 1.0 M
A solution with the following ingredients is used to measure the starting rate of sucrose breakdown: 0.01 M H+, 1.0 M sucrose, 0.1 M fructose, and 0.1 M glucose.
The rate of the reaction when is changed to 0.001 M = R'
R = k [0.0001M] [1.0 M]
2 / 1
R' = 0.01 x R
Thus, the rate change is [H⁺] is changed to 0.0001 M is 0.01.
To learn more about the acidic solutions, refer to the below link:
brainly.com/question/13655896
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