It helps to map out how you will navigate through your unit analysis problem before setting it up.
You are given moles and need grams. What can be used as a conversion factor from moles to grams? Molar mass. We are working with aluminum, so we will need the molar mass of aluminum. My Periodic Table tells me the molar mass of aluminum is approximately 27 g/mol. Now we are ready to set up the unit analysis.
Moles must go on the bottom so that they cancel. Notice how our number of significant figures is 2, so the answer must round to 16 g Al.
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Answer:</h3>
16 grams
A. 2
trust me i used to so this in middle school
Answer:
The rate of reaction of a zero-order reaction is 0.0020 mol/L.
Explanation:
The rate expression of the zero order kinetic are :
[A]= initial concentration of reactant
k = rate constant
R = rate of reaction
We have :
Rate constant of the reaction , k = 0.0020 mol/L s
R = 0.0020 mol/L s
The rate of reaction of a zero-order reaction is 0.0020 mol/L.
Answer:
Option D.
Explanation:
Let's apply the Ideal Gases law to solve the problem.
P . V = n . R . T
First of all we convert the temperature value from °C to K
77°C + 273 = 350K
and the pressure from mmHg to atm
623 mmHg . 1 atm/760 mmHg = 0.82 atm
We replace data: 0.82 atm . 17.5L = n . 0.082 L.atm/mol.K . 350K
(0.82 atm . 17.5L) / (0.082 L.atm/mol.K . 350K) = n
0.50 moles = n
These are the moles that corresponds to 22 g of the gas, so the molar mass will be → 22g / 0.50 mol = 44 g/mol
That molar mass corresponds to CO₂ → 12 g (C) + 16 g (O) . 2 = 44 g/mol
All other elements react with other elements to form compounds. In the special case where the reaction produces fixed numbers of the same types of atoms in exactly the same configuration, we say the elements have formed a molecule.