<span>Moles = 0.252
Molarity = 1.07
This question is badly worded. You're asking for moles and I suspect you really want molarity. The number of moles of ammonium chloride you have in the solution will remain constant regardless of the volume of the solution. However, the molarity of the solution will differ depending upon how concentrated it is. So I'll give you both the number of moles of ammonium chloride you have, and the molarity of the resulting solution. Please talk to your teacher if you're confused by the difference between moles and molarity.
The formula for ammonium chloride is NH4Cl. So let's calculate it's molar mass. Start by looking up the associated atomic weights.
Atomic weight nitrogen = 14.0067
Atomic weight hydrogen = 1.00794
Atomic weight chlorine = 35.453
Molar mass NH4Cl = 14.0067 + 4 * 1.00794 + 35.453 = 53.49146 g/mol
Moles NH4Cl = 13.5 g / 53.49146 g/mol = 0.252376735 mol
Molarity is defined as moles per liter, so let's divide the number of moles we have by the volume in liters. So:
0.252376735 mol / 0.235 l = 1.073943551 M
Rounding to 3 significant figures gives: 0.252 moles, 1.07 molarity.</span>
Answer:
3.7 ×10⁴ m
Explanation:
We know that,
1 miles = 1609.34 meter
We need to find how many meters are there in 23.1 miles.
23 miles = 37175.85 m
or
23 miles = 3.7 ×10⁴ m
So, there are 3.7 ×10⁴ m in 23.1 miles.
Answer:
Kj/mol
Its an endothermic reaction
Explanation:
Enthalpy can be evaluated by using following formula -
where
q is the enthalpy or change in internal energy
m is the mass in kg
c is the specific heat
and 
is the change in temperature
Mass of HCl is equal to 
g/mol
or
Mass of HCl is equal to 
Kg/mol
Substituting the given values in above equation, we get-
Kj/mol
Enthalpy is positive thus it is an endothermic reaction
Answer:
The molarity of NaOH is 0.02 M.
Explanation:
Given data:
Volume of HCl = 18.7 mL
Molarity of HCl = 0.01500 M
Volume of NaOH = 15.00 mL
Molarity of NaOH = ?
Solution:
M₁V₁ = M₂V₂
0.01500 M × 18.7 mL = M₂ × 15.00 mL
M₂ = 0.3 M.mL /15.00 mL
M₂ = 0.02 M
The molarity of NaOH is 0.02 M.
Answer:
A pH greater than 7 is basic. The pH scale is logarithmic and as a result, each whole pH value below 7 is ten times more acidic than the next higher value. For example, pH 4 is ten times more acidic than pH 5 and 100 times (10 times 10) more acidic than pH 6.
