Answer:
102g
Explanation:
To find the mass of ethanol formed, we first need to ensure that we have a balanced chemical equation. A balanced chemical equation is where the number of atoms of each element is the same on both sides of the equation (reactants and products). This is useful as only when a chemical equation is balanced, we can understand the relationship of the amount (moles) of reactant and products, or to put it simply, their relationship with one another.
In this case, the given equation is already balanced.
From the equation, the amount of ethanol produced is twice the amount of yeast present, or the same amount of carbon dioxide produced. Do note that amount refers to the number of moles here.
Mole= Mass ÷Mr
Mass= Mole ×Mr
<u>Method 1: using the </u><u>mass of glucose</u>
Mr of glucose
= 6(12) +12(1) +6(16)
= 180
Moles of glucose reacted
= 200 ÷180
= mol
Amount of ethanol formed: moles of glucose reacted= 2: 1
Amount of ethanol
=
= mol
Mass of ethanol
=
=
= 102 g (3 s.f.)
<u>Method 2: using </u><u>mass of carbon dioxide</u><u> produced</u>
Mole of carbon dioxide produced
= 97.7 ÷[12 +2(16)]
= 97.7 ÷44
= mol
Moles of ethanol: moles of carbon dioxide= 1: 1
Moles of ethanol formed= mol
Mass of ethanol formed
=
= 102 g (3 s.f.)
Thus, 102 g of ethanol are formed.
Additional:
For a similar question on mass and mole ratio, do check out the following!
a gas behaves more like an ideal gas at higher temperature and lower pressure, as the potential energy due to intermolecular forces becomes less significant compared with the particles' kinetic energy, and the size of the molecules becomes less significant compared to the empty space between them.
Answer:
The answer to your question is
3KOH (aq) + FeCl₃(aq) ⇒ Fe(OH)₃ (s) + 3KCl (aq)
Explanation:
Data
Potassium hydroxide = KOH
Iron (III) chloride = FeCl₃
Iron (III) hydroxide = Fe(OH)₃
Potassium chloride = KCl
- Write the chemical equation
KOH (aq) + FeCl₃(aq) ⇒ Fe(OH)₃ (s) + KCl (aq)
Reactants Elements Products
1 K 1
1 Fe 1
3 Cl 1
1 H 3
1 O 3
This reaction is unbalanced
- Balancing the reaction
3KOH (aq) + FeCl₃(aq) ⇒ Fe(OH)₃ (s) + 3KCl (aq)
Reactants Elements Products
3 K 3
1 Fe 1
3 Cl 3
3 H 3
3 O 3
This reaction is now balanced
Answer:
The correct answer is option C.
Explanation:
Half life for second order kinetics is given by:
= half life = 15.4 s
k = rate constant =?
= initial concentration = 0.67 M
is the rate constant for this reaction.
Last option:
CO2 (g) + H2O (l) -> H2CO3 (aq)
In the brackets:
g = gas,
l = liquid,
s = solid,
aq = aqueous.
So,
CO2 (g) = carbon dioxide gas
H2O (l) = liquid water
H2CO3 (aq) = aqueous carbonic acid