Answer:
6 hours
Explanation:
If it is traveling at 50mph and needs to reah 300 miles, to figure this problem out you would want to divide 300 by 50 to get 6 hours. So it will take six hours until the car travels 300 miles
Hope this helps.
Answer:
To find the noble gas notation, you first take the noble gas before the element you’re trying to find the notation for. In this case, the noble gas before Calcium is Argon. You put the symbol for Argon in square brackets, and then you write out the rest of the notation as you would normally.
This would look like [Ar]4s^2
The 4s^2 is because Calcium is the second element in the 4s columns (refer to the diagram)
Hope this helps :)
Explanation:
hope the picture above helps you to understand:)
Answer:
11.442E23molecules
Explanation:
Given data:
Number of moles of water = 1.9 mol
Number of molecules of water = ?
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
In 1.9 moles:
1.9 mol × 6.022 × 10²³ molecules / 1 mol
11.442 × 10²³ molecules
In e notation:
11.442E23 molecules
Explanation:
Total volume of the solution will be (10 ml + 10 ml) = 20 ml. As there are 1000 ml in 1 L. So, 20 ml will be equal to 0.02 L.
As molarity equals number of moles divided by volume in liter. Hence, calculate number of moles of 
as follows.
No. of moles = 
= 
= 
mol
Hence, moles of 
will also be equal to mol.
Now, calculate the no. of moles of 
as follows.
No. of moles = 
= 
= mol
As there are 2 ions in 1 mole of . Hence, in mol number of ions will be 
mol.
When both the solutions are mixed together then molarity of the solution will be calculated as follows.
Molarity of solution = 
= 
= 0.015 M
Thus, we can conclude that the molar concentration of Na (aq) in the given solution is 0.015 M.
