Answer:
1.2 x 10²⁴atoms
Explanation:
Given parameters:
Molar mass of Mg = 24.3g/mol
Mass of Mg = 48.6g
Number of atoms in 1 mole = 6.02 x 10²³ atoms
Solution
We know that
1 mole contains 6.02 x 10²³ atoms
Now we have to find the number of moles that are in the given mass of the magnesium atom.
Number of moles =
Number of moles = = 2mole
Now 2 moles of Mg will contain 2x 6.02 x 10²³ atoms = 1.2 x 10²⁴atoms
3rd: Every action has an equal and opposite reaction. So the third law basically says that if you shoot out stuff in one direction you will move in the other direction. This is howrockets work in a vacuum. They have a source of fuel which is heated up so that it expands and is pushed out of the rocket.
Hope this helps a little... ^^
14. C
15. B
16. D
17. D
18. I am not sure sorry.<span />
Yes just like with sugar and water temperature affects the process and warmer water causes faster dissolution.
Answer:
6.05 × 10⁴ cal
Explanation:
Step 1: Given and required data
Mass of water (m): 112 g
Enthalpy of vaporization of water (ΔHvap): 540 cal/g
Step 2: Calculate how much energy is required to vaporize 112 g of water
Vaporization is a physical change in which a substance goes from the liquid state to the gaseous state. We can calculate the energy required (Q) using the following expression.
Q = ΔHvap × m
Q = 540 cal/g × 112 g = 6.05 × 10⁴ cal