After the change of temperature and pressure-> the number of moles of the gas is still the same.
n1=P1*V1/RT1
n2=P2*V2/RT2
R=0.082 constant... you can cancel it out
n1=n2
10C=10+273.15K=283.15K
120c=120+273.15k=393.15
P1*V1/T1=P2*V1/T2
1*0.021/283.15=15*V2/393.15
V2=1.943*10^-3 L = 1.943ml
Answer:
2 moles of C-12 have 24g mass
Explanation:
Given data:
Number of moles of C-12= 2 mol
Mass of C-12 = ?
Solution:
Formula:
Number of moles = mass / molar mass
Molar mass of C-12 = 12 g/mol
Now we will put the values in formula.
2 mol = mass / 12 g/mol
Mass = 2 mol × 12 g/mol
Mass = 24 g
Thus 2 moles of C-12 have 24 g mass.
Questions are as follow, and answered one by one,
(1) What is step 1 in solving the problem?
Answer:
First of all moles of NaOH are calculated. This is done by applying following formula,
Moles = n = Mass / M.mass
(2) What is the molar mass of NaOH?
Answer:
Add all atomic masses of elements in NaOH to find the Molar mass.
Atomic Mass of Na = 22.98 g/mol
Atomic Mass of O = 16.00 g/mol
Atomic Mass of H = 1.008 g/mol
_______________
Molar Mass of NaOH = 39.988 g/mol
<span>(3) What is the Molarity of this solution?
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Answer:
Molarity = Moles / Vol
∴ Moles = 40g / 39.988g/mol = 1.0 mol
So,
Molarity = 1.0 mol / 6.0 L
Molarity = 0.16 mol.L⁻¹
Answer:
The correct answer is pH relates to relative acid-base ion balance in a solution.
Explanation:
This is because pH is a measure of the concentration of hydrogen ions in a solution. Also the higher the number of Hydrogen ions in a solution, the higher the acidicity and the lower the pH.