Answer:
33.58%
Explanation:
Data obtained from the question include:
Mass of CuS = 9.56g
Mass of Cu = 6.35g
Mass of S = Mass of CuS — Mass and Cu
Mass of S = 9.56 — 6.35
Mass of S = 3.21g
The percentage by mass of sulphur in CuS is given by:
Mass of S/mass of CuS x 100
Percentage by mass of S = 3.21/9.56 x 100 = 33.58%
Answer:
The answer is
<h2>1.20 g/mL</h2>
Explanation:
The density of a substance can be found by using the formula
From the question
mass of liquid = 138 g
volume = 115 mL
The density is
We have the final answer as
<h3>1.20 g/mL</h3>
Hope this helps you
This statement is TRUE.
The polarity of the molecule is caused by unequal sharing of the electrons in the covalent bond. Even though the carbon dioxide molecule is made from two different atoms, two oxygen atoms and one carbon atom, the CO2 molecule is non polar because of the structure of the molecule.
The CO2 has a linear, symmetrical structure. This means that the two oxygen atoms with greater electronegativity are symmetrically placed around the carbon molecule. This arrangement of atoms causes a balance in the sharing of the electrons, making the molecule non polar.
Answer:
2. Copper (II) carbonate plus sulfuric acid produces copper (II) sulfate and carbon dioxide and water.
- We need the "II" after copper to specify what charge it is. It's +2 because carbonate is -2.
3. Calcium hydroxide plus carbon dioxide gas produces calcium carbonate and water.