Molarity is defined as the number of moles in 1 L of solution.
Mass of NaNO₃ present - 85.0 g
Molar mass of NaNO₃ - 85 g/mol
The number of NaNO₃ moles - 85.0 g / 85 g/mol = 1 mol
Volume of solution - 750 mL
The number of moles in 0.750 mL - 1 mol
Therefore in 1 L solution, number of NaNO₃ moles - 1/0.75 = 1.33 mol
Therefore molarity of solution - 1.33 M
Chemical tests show that it is an alkaline earth metal. (a) The family of alkaline earth metals lies in group II of the periodic table indicating that each member of this family has 2 valence electrons. This therefore implies that the new element must also have only 2 electrons in its outermost orbit.
Answer:
b hope I am right if not I am so sorry
Explanation:
Answer:
The standard enthalpy of formation of methane is -67.2 kJ/mol.
Explanation:
...[1]
...[2]
...[3]
Since, the bond formation is taking place energy will release that id reaction will be an exothermic reaction
...[4]
Using Hess's law:
[4] = [1] + [2] + [3]
The standard enthalpy of formation of methane is -67.2 kJ/mol.
The concentration of OH⁻ is first converted to pOH bu using followinf formula,
pOH = -log [OH⁻]
Putting value,
pOH = -log (0.006)
pOH = 2.221
As we know,
pH + pOH = 14
Solving for pH,
pH = 14 - pOH
Putting value of pOH,
pH = 14 - 2.221
pH = 11.779
Result:
Option-1 is the correct answer.