Answer:
A model can represent something very large like the solar system, A model can represent something very small like a single cell, A model can represent something that cannot be seen or touched, A model can represent something very complex like the flow of energy in an ecosystem.
Explanation:
CaSO4 - to find the molar mass, you add the element's mass number.
40.08 + 32.06 + (16x4)
= 136.14
Answer:
20.5 × 10²³ molecules of He
Explanation:
Given data:
Number of moles of He = 3.40 mol
Number of molecules of He = ?
Solution:
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 3.40 moles of He:
3.40 mol × 6.022 × 10²³ molecules
20.5 × 10²³ molecules of He
<span>In an equation, the symbol that would indicate a mixture is c (aq). The meanings of the symbols are: (s) - solid, (l) - liquid, (g) gas, and (aq) - aqueous. Symbol (aq) means that something is dissolved in the water. It represents an aqueous solution. </span>
Answer:
It is a molecular compound.
Explanation: