Answer: polymers
A polymer are large molecules made up of repeating units, referred to as monomers.
Explanation:
Polymers are macromolecule with large size and high molecular mass. They consists of several repeating units of simpler molecules known as monomers.
Examples of polymers found in plants are
- starch composed of several glucose units linked by glycosidic bonds
- cellulose composed of several repeating glucose units linked by glycosidic bonds as well
An example of polymers found in animals is
- glycogen composed of several units of glucose monomers linked by glycosidic bonds
Answer:
Number of molecules = 23.9 × 10²³ molecules
Number of moles = 3.97 mol
Explanation:
Mass of HNO₃ = 250 g
Number of moles = ?
Number of molecules = ?
Solution:
Number of moles = mass / molar mass
Number of moles = 250 g/63 g/mol
Number of moles = 3.97 mol
Number of molecules:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
For 250 g of HNO₃:
250 g/ 63 g/mol = 3.97 mole
3.97 × 6.022 × 10²³ molecules = 23.9 × 10²³ molecules
Answer:
The all 4 the given statements are part of Dalton's atomic theory.
Explanation:
Dalton's postulates or Dalton's atomic theory:
- Matter is made up of small particles termed as atom.
- Atoms are indivisible particle.
- Atoms of different element have different masses and properties.
- Atoms of the same element have the identical size, mass, and structure.
- During chemical reaction, rearrangement of atoms takes place.
- Atoms of different different combines together to form new compounds in simple whole number ratio.
To find this you have to find the molar mass of CO2 which you can get on the periodic table, 12 + 16 + 16 = 44 g/mol
4.49 x 10^0 / 44 g/mol = .1020 mol CO2
1 mol = 6.022 x 10^23 molecules (avogadros number)
so .1020 mol x 6.022 x 10^23 =
6.14 x 10 ^22 molecules CO2
