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2 answers:
Answer: The mass of 1 mole of is 101.96 amu.
Explanation:
is a compound. One mole of a compound has a mass which is equal to the molecular weight (molar mass) of the compound expressed in 'amu' and it contains
molecules of that compound.
To calculate the molar mass of the compound, we multiply the number of atoms of an element with its atomic mass. Molar mass of will be:
Atomic mass of Aluminium = 26.98 amu
Number of atoms of Aluminium = 2
Atomic mass of Oxygen = 16.00 amu
Number of atoms of Oxygen = 3
Molecular weight of =
= 101.96 amu
Hence, the mass of 1 mole of is 101.96 amu.
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Answer: 0.87 g of an 8% w/w progesterone gel must be mixed with 1.45 g of a 4% w/w progesterone gel to prepare a 5.5% w/w gel.
Explanation:
According to the dilution law,
where,
= concentration of ist progesterone gel = 8%w/w
= weight of ist progesterone gel = x g
= concentration of another progesterone gel = 4% w/w
= weight of another progesterone gel = 1.45 g
= concentration of resulting progesterone gel = 5.5%w/w
= weight of resulting progesterone gel = (x+1.45) g
Thus 0.87 g of an 8% w/w progesterone gel must be mixed with 1.45 g of a 4% w/w progesterone gel to prepare a 5.5% w/w gel.
When base is added in order to increase the pH of a solution, it results in MOH salt <u>precipitating first.</u>
Equation :
MOH (s) ⇄ M⁺ (aq) ₊ OH⁻(aq)
K = [M⁺] [OH⁻]
K = 1.39×10⁻¹² and [M⁺] = 0.001M
∴ 1.39×10⁻¹² = (0.001M) [OH⁻]
[OH⁻] = 1.004×10⁻¹⁹M
pOH = -log [OH⁻] = 11.9
pH = 14 - pOH
= 14 - 11.9
<u>pH = 2.1</u>
To learn more about solubility equilibrium ;
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