Answer:
110 g
Explanation:
Step 1: Write the balanced equation for the decomposition of calcium carbonate
CaCO₃(s) ⇒ CaO(s) + CO₂(g)
Step 2: Convert 260.0 °C to Kelvin
We will use the following expression.
K = °C + 273.15 = 260.0 + 273.15 = 533.2 K
Step 3: Calculate the moles of CO₂ produced
We will use the ideal gas equation.
P × V = n × R × T
n = P × V/R × T = 1 atm × 48.0 L/0.0821 atm.L/mol.K × 533.2 K = 1.10 mol
Step 4: Calculate the moles of CaCO₃ that reacted to produce 1.10 moles of CO₂
The molar ratio of CaCO₃ to CO₂ is 1:1. The moles of CaCO₃ that reacted are 1/1 × 1.10 mol = 1.10 mol.
Step 5: Calculate the mass corresponding to 1.10 moles of CaCO₃
The molar mass of CaCO₃ is 100.09 g/mol.
1.10 mol × 100.09 g/mol = 110 g
It will be harder than others.
Answer:
1.75M
Explanation:
Given parameters:
Initial volume of acid, HCl = 450mL = 0.45L
Initial concentration = 3.5M
Final volume = 0.9L
Unknown:
Final concentration = ?
Solution:
This is a dilution problem in which a particular concentration is made from the stock of known concentration.
One important approach to solve this problem is to remember that the number of moles in the initial and final solution will always remain the same.
Since we know this;
Number of moles = molarity x volume;
let us find the number of moles of the initial solution;
Number of moles = 3.5 x 0.45 = 1.58moles
Now, to find the new molarity;
Molarity =
Input the parameters;
Molarity = = 1.75M
Burette is the lab equipment used to estimate the volume of liquid during titration. The volume is measured by the bottom meniscus to the nearest 0.01 mL.
<h3>What is a burette?</h3>
Burette is an instrument used in quantitative analysis like the volume of the sample in the titration methods and is made of a glass tube.
In the volumetric analysis, the final volume of the liquid is measured by locating the lower meniscus and is taken approximately near 0.01 ml as the burettes have markings of 0.1 mL.
Therefore, option a. locate the bottom meniscus and mark nearest to 0.01 mL.
Learn more about meniscus here:
brainly.com/question/4070509
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