Answer:
Cell is defined as the smallest unit or basic unit of life.
Answer:
43.47 g
Explanation:
The <em>boiling point elevation</em> is described as:
Where ΔT is the difference in boiling points: 120.6-118.4 = 2.2 °C
K is the boiling point elevation constant, K= 2.40 °C·kg·mol⁻¹
and m is the molality of the solution (molality = mol solute/kg solvent).
So first we <u>calculate the molality of the solution</u>:
- 2.2 °C = 2.40 °C·kg·mol⁻¹ * m
Now we calculate the moles of benzamide (C₇H₇NO, MW=315g/mol), using the given mass of the liquid X.
- 150 g ⇒ 150/1000 = 0.150 kg
- 0.917 m = molC₇H₇NO / 0.150kg
Finally we convert moles of C₇H₇NO into grams, using its molecular weight:
- 0.138 molC₇H₇NO * 315g/mol = 43.47 g
If you don't wash the thermometer, residual NaOH will react with the HCl solution. This is a highly exothermic reaction and will change the temperature of the solution, and thus throw off your measurement.
net ionic equation
B) SO₄²⁻ (aq) + Ba²⁺ (aq) → BaSO₄ (s)
Explanation:
We have the following chemical equation:
2 Na⁺ (aq) + SO₄²⁻ (aq) + Ba²⁺ (aq) + 2 Cl⁻ (aq) → 2 Na⁺ (aq) + 2 Cl⁻ (aq) + BaSO₄ (s)
To get the net ionic equation we remove the spectator ions and we get:
SO₄²⁻ (aq) + Ba²⁺ (aq) → BaSO₄ (s)
were:
(aq) - aqueous
(s) - solid
Learn more about:
net ionic equation
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