Answer:
1. 6.45 L
2. 1.76 x 10²³ molecules
Explanation:
1. Avagadros law states that volume of gas at constant temperature and pressure is directly proportional to the amount / number of moles of that gas
we can use the following equation
v1/n1 = v2/n2
where v1 is volume and n1 is number of moles at first instance
and v2 is volume and n2 is number of moles at second instance
at the first instance - n1 = 0.218 mol
second instance - n2 = 0.218 mol + 0.075 mol = 0.293 mol
substituting the values
4.8 L / 0.218 mol = v2 / 0.293 mol
v2 = 6.45 L
new volume is 6.45 L
2. 1 mol of any substance is made of 6.022 x 10²³ units. These units could be atoms making up elements or molecules making up a compound.
therefore if 1 mol consists of 6.022 x 10²³ molecules
then 0.293 mol consists of - 6.022 x 10²³ molecules/mol x 0.293 mol = 1.76 x 10²³ molecules
therefore there are 1.76 x 10²³ molecules now in the cylinder
Answer:
1) 6(1/2)
2) 8(4/5)
Explanation:
1) 7 - 1/2 = 7/1 - 1/2 = 14/2 - 1/2 = 13/2 = 6(1/2)
2) 11(2/5) - 2(3/5) = 57/5 - 13/5 = 44/5 = 8(4/5)
Answer:
The new pressure is 2, 74 atm
Explanation:
We apply Boyle Mariotte's law, where for a given mass of gas at constant temperature, the pressure and volume vary inversely proportionally: P1xV1 = P2xV2 P2=( P1 x V1)/V2 1 L-----1000L--->( 140ml/1000ml)x1L=0,140 L
(50ml/1000ml)x 1L =0,050L
P2= (0,980 atm x 0,140 L)/0,050L= 2, 744 atm
Answer:
Time take to deposit Ni is 259.02 sec.
Explanation:
Given:
Current 
A
Faraday constant 
Molar mass of Ni 
Mass of Ni 
g
First find the no. moles in Ni solution,
Moles of Ni 
mol
From the below reaction,
⇆ 
Above reaction shows "1 mol of 
requires 2 mol of electron to form 1 mol of "
So for finding charge flow in this reaction we write,
Charge flow 
C
For finding time of reaction,
Where 
charge flow
sec
Therefore, time take to deposit Ni is 259.02 sec.
