Answer:
Number of moles of C₂H₂ = 13.3 mol
Number of moles of Co = 0.92 mol
Explanation:
Given data:
Number of molecules of C₂H₂ = 7.98 ×10²⁴
Number of moles of C₂H₂ = ?
Mass of Co = 25.8 g
Number of moles of Co = ?
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 C₂H₂:
1 mol = 6.022 × 10²³ molecules
7.98 ×10²⁴ molecules × 1 mol / 6.022 × 10²³ molecules
1.33×10¹ mol
13.3 mol
For Co:
Number of moles = mass/ molar mass
Number of moles = 25.8 g/ 28 g/mol
Number of moles = 0.92 mol
The answer for the following questions is explained below.
Explanation:
The two variables that affect kinetic energy are:
- mass and
- velocity
- velocity - The faster an object moves,the more the kinetic energy it has.
- mass - Kinetic energy increases as mass increases
The kinetic energy of an object depends on both its mass and its velocity
Kinetic energy increases as mass increases
For example,think about rolling a bowling ball and a golf ball down a bowling lane at same velocity
Here,the bowling ball has more mass than the golf ball
Therefore you use more energy to roll the bowling ball than to roll the golf ball
The bowling ball is more likely to knock down the pins because it has more kinetic energy than the golf ball
An ionic bond occurs when an atom transfers or takes Electrons from another atom.
Answer:
B) It turns clear phenolphthalein pink.
Explanation:
KOH is a basic solution.
It turns red litmus paper turns blue.
It turns clear phenolphthalein pink.
The reagent which reacts with metals to form hydrogen gas is acid.
So, the right choice is:
B) It turns clear phenolphthalein pink.
It means it will only allow some to go through but not all.