Answer:
22.1 g
Explanation:
The balanced reaction equation which serves as a guide in solving the problem is given as;
CaO(s) + 2NaCl(aq) ------> Na2O(s) + CaCl2(aq)
The question clearly specifies that sodium chloride is the reactant in excess. This means that calcium oxide should be used to calculate the theoretical yield of sodium oxide.
Number of moles of calcium oxide reacted = mass of calcium oxide / molar mass of calcium oxide
Molar mass of calcium oxide = 56.0774 g/mol
Mass of calcium oxide = 20.0g
Number of moles of calcium oxide = 20.0 g/ 56.0774 g/mol = 0.3566 moles
From the balanced reaction equation;
1 mole of calcium oxide produces 1 mole of sodium oxide
Therefore, 0.3566 moles of calcium oxide will produce 0.3566 moles of sodium oxide.
Mass of sodium oxide produced = number of moles × molar mass
Molar mass of sodium oxide= 61.9789 g/mol
Mass of sodium oxide = 0.3566 moles × 61.9789 g/mol
Mass of sodium oxide= 22.1 g
Answer:
22.1g
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
CaO + 2NaCl —> Na2O + CaCl2
Next, we shall determine the mass of CaO that reacted and the mass of Na2O produced from the balanced equation.
This is illustrated below:
Molar mass of CaO = 40 + 16 = 56g/mol
Mass of CaO from the balanced equation = 1 x 56 = 56g
Molar mass of Na2O = (23x2) + 16 = 62g/mol
Mass of Na2O from the balanced equation = 1 x 62 = 62g
From the balanced equation above,
56g of CaO reacted to produce 62g of Na2O.
Finally, we can determine the theoretical yield of Na2O as follow:
From the balanced equation above,
56g of CaO reacted to produce 62g of Na2O.
Therefore, 20g of CaO will react to produce = (20 x 62)/56 = 22.1g of Na2O.
Therefore, the theoretical yield of Na2O is 22.1g
b. False
Answer:
A radical is a group of atoms that remains bonded together and behaves as a single atom in a chemical reaction. True (a.)
Chemistry is the study of the properties, composition, and structure of substances, and the transformations they undergo. It also deals with the energy exchanges in these processes. As "The Central Science", chemistry interrelates with numerous other scientific disciplines.
Chemistry, often referred to as "The Central Science", is a branch of science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes. It plays a vital role in multiple disciplines such as biology, medicine and environmental science. It allows us to understand the makeup of substances, from the atomic level to complex molecules, and how they interact through chemical reactions.
One example of a branch of Chemistry is thermochemistry, which focuses on relationships between heat, work, and other types of energy in physical and chemical processes. Dalton's atomic theory, investigating quantitative and qualitative aspects of chemistry, also developed the concept of atomic mass units, allowing for the calculation of formula mass and the quantitative description of substances.
#SPJ11
Answer:
Element Symbol Atomic Mass # of Atoms Mass Percent
Lead Pb 207.2 1 46.732%
Explanation:
Answer:
I don't know
Explanation:
mixture of iron powder and sulphur heated it glows because sulphur and iron are more reactive metals that they shine and sulphur can react with water produce fire it's write
topaz
talc
diamond
graphite
Hi there, thanks for asking a question here on Brainly!
The hardest known mineral in this planet is the diamond.
Answer: Letter C ✅
Hope that helps! ★
Answer:
1. Sand Casting: Sand casting is a popular method used to create pewter objects. Here's how it's achieved:
- First, a pattern or model of the desired object is created using materials like wood, plastic, or metal.
- The pattern is then pressed into a special type of sand called green sand, leaving an impression.
- Next, the pattern is removed, leaving a cavity in the sand.
- Molten pewter is poured into the cavity and left to cool and solidify.
- Once cooled, the sand is carefully removed, revealing the pewter object.
2. Spin Casting: Spin casting, also known as centrifugal casting, is another way to mold pewter. Here's how it works:
- A rubber mold of the object is created, usually using a master pattern made of wax or another material.
- The rubber mold is placed in a casting machine that rotates at high speed.
- Molten pewter is poured into the mold while it spins.
- The centrifugal force evenly distributes the pewter, filling the mold's cavities.
- As the pewter cools, it solidifies and takes the shape of the mold.
- Once cooled, the mold is opened, and the pewter object is removed.
3. Die Casting: Die casting is a method used for producing high-quality pewter objects. Here's how it's done:
- A metal mold, called a die, is created to match the desired shape of the object.
- Molten pewter is injected into the die under high pressure.
- The pressure ensures that the pewter fills the mold completely and captures all the intricate details.
- After a short cooling period, the die is opened, and the pewter object is ejected.
Explanation:
These are just a few ways to form or mold pewter. Each method has its advantages and is suitable for different types of objects. It's important to choose the appropriate method based on the complexity of the design and the desired quality of the final product.