Answer:
9.2 grams of ethanol should be added.
Explanation:
Let the mass of ethanol be x
Density of an ethanol =
Volume of the ethanol =
Mass of chloroform = 5.0 g
Density of an chloroform=
Volume of the ethanol =
Mass of the mixture,m = x + 5.0 g
Density of the mixture =
Volume of the mixture=
Solving for x , we get
x = 9.2 g
9.2 grams of ethanol should be added.
Answer:
7.58
Explanation:
Given that
A buffer solution obtained by dissolving 13.0 g of KH₂PO₄ and 26.0 g of Na₂HPO₄ in water and then diluting to 1.00 L.
pKa = 7.21.
To get the PH we are going to use Henderson - Hasselblach equation:
PH = Pka + ㏒ [A/AH]
when the molar mass of Na2HPO4 = 142 g/mol
and A is the conjugate base HPO4-- ions so,
∴[A] = 32g / 142 g/mol
= 0.225 M
and when the molar mass of KH2PO4 = 136 g/mol
and AH is the weak acid H2PO4- ions so,
∴[AH] = 13 g / 136 g/mol
= 0.096 M
and when we have the Pka value of H3PO4 = 7.21
so, by substitution:
∴ PH = 7.21 + ㏒ (0.225 / 0.096)
= 7.58
Because their atoms have the same number of electrons in the highest occupied energy level
Answer:
Chemical digestion is a vital part of the digestive process. Without it, your body wouldn't be able to absorb nutrients from the foods you eat, also chemical digestion uses enzymes to break down food
mechanical digestion involves physical movements, such as chewing and muscle contractions,
Explanation:
What they have in common is that they both have the same number of atoms. Hope this helps. :)