Answer:
8.34 moles
Explanation:
We are given 8.34 moles.
We need to find moles: 8.34
The states of matter change to produce the same or the new substance. When yeast is added to hydrogen peroxide bubble of carbon dioxide is formed which indicates chemical change.
<h3>What is a chemical change?</h3>
A chemical change is the formation of a new substance by the chemical alterations in the reactants. The yeast releases products of cellular respiration that react with hydrogen peroxide.
The reaction is exothermic as it releases heat and increases the temperature when measured by the thermometer. The Fizzing and bubbling occur when carbon dioxide reacts with H₂O₂ to produce a new substance.
Therefore, addition of yeast to hydrogen peroxide is a chemical change.
Learn more about chemical change here:
brainly.com/question/27935965
#SPJ1
Answer:
Calculate the frequency of light having wavelength of 456 nm.
1.22*10^8nm
Explanation:
The question is incomplete, the complete question is; Describe the preparation of 2.00 L of 0.108 M BaCl2 from BaCl2.2H2O
Answer:
See explanation
Explanation:
First we must know the molar mass of the compound = 244.3 g/mol
Now we must calculate the number of moles of BaCl2.2H2O in the solution.
number of moles = concentration * volume = 0.108 M * 2.00 L = 0.216 moles
Now the mass of solid that we need to take can be obtained from;
number of moles = mass/molar mass
mass = number of moles * molar mass
mass = 0.216 moles * 244.3 g/mol
Mass = 52.8 g
Hence, we must weigh 52.8 g of BaCl2.2H2O accurately in a balance and dissolve it in 2 L of water to give 0.108 M solution of BaCl2.2H2O.
