What is the percent composition of calcium (Ca) in CaO?A 56g/40g x 100%
B 16g/56g x 100%
C 40g/56g x 100%
D 40g/100% x 56g
Answers
Answer:
C 40 g/56 g × 100 %
Explanation:
Calculate the mass of each component and the total mass.
Element Atomic mass/u No. of atoms Subtotal mass/u
Ca 40.08 1 40.08
O 16.00 1 16.00
Total = 56.08
The formula for mass percent is
% by mass = Mass of component/Total mass × 100 %
In this problem
% Ca = mass of Ca/mass of CaO × 100 %
% H = 40.08 g/56.08 g × 100 %
The percentage composition of calcium (Ca) in CaO is option C.
- Here we have to determine the mass of every component and even the total mass.
Element Atomic mass/u No. of atoms Subtotal mass/u
Ca 40.08 1 40.08
O 16.00 1 16.00
Total = 56.08
- The mass percent formula is
Therefore, we can conclude that the correct option is C.
Learn more: brainly.com/question/362440
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How are elliptical galaxies different from spiral galaxies?a. They contain older stars and less gas and dust.b. They contain younger stars and more gas and dust.c. They are bigger than spiral galaxies.d. They are smaller than spiral galaxies.
b. the frogs are a limiting factor for the gnats.
c. the gnats are a limiting factor for the frogs.
d. the chemical is a limiting factor for the gnats.
Answers
Answer:
The correct answer is option b.
Explanation:
A limiting factor or limiting reagent is a compound of reactant which gets used up first and effects the formation of product in a chemical reaction.
Around the pond frog would be feeding on gnat, and due to their presence population of gnats were in control .But due to accidental spilling of chemical in pond resulted in death of frogs. Which were actually responsible for less population of gnats around the pond but due to dead action of chemical on them (frogs) their population in pond declined due to which increase in population of gnats was observed.
On generalizing this fact:
- Higher the population of frogs lower will be the population of gnats.
- lower the population of frogs higher will be the population of gnats.
So, from this we can conclude that frogs are the limiting factors for the gnats as more the number of frogs lessor will be number of gnats.
the frogs limit the reproduction of the gnats, and therefore with less frogs the gnat population can increase
- C=C : 835
- C≡C : 612
Answers
Answer:
The order of increasing bond lenght :
-C≡C < -C=C < -C-C
Explanation:
Bond length is defined as average distance between two nuclei of bonded atoms in a molecule.Bond length is inversely proportional to the number of bonds present between two atoms.
...[1]
Bond energy is defied as amount of energy required to break apart the bond of 1 mole of molecule into their individual atom.
Bond energy is directly proportional to the number of bonds present between two atoms.
..[2]
From [1] and [2]:
Bond : Energy (kJ/mol)
-C-C : 346
-C=C : 612
-C≡C : 835
The order of decreasing bond energy :
835 kJ/mol > 612 kJ/mol > 346 kJ/mol
The order of increasing bond lenght :
-C≡C < -C=C < -C-C
Answers
Answer:
Explanation:
pom, add
B. Diffusion
C. Active transport
D. Phagocytosis
Answers
Final answer:
Water leaves the cell by osmosis when placed in salt water.
Explanation:
When a cell is placed in salt water, water leaves the cell by osmosis. Osmosis is the movement of water molecules across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Learn more about Osmosis here:
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Answers
The answer is Red and Blue light.
Answers
Answer: When you overmix the muffin batter, it crushes the air bubbles and ruins the fluffy texture.
Explanation: → Follow this tip: To ensure a batch of light, fluffy muffins, mix the dry ingredients with the wet ingredients until just barely combined, and no more dry flour is visible.