Answer:
1.634 molL-1
Explanation:
The mol ration between NH3 and HCl is 1 : 1
Using Ca Va / Cb Vb = Na / Nb where a = acid and b = base
Na = 1
Nb = 1
Ca = 0.208 molL-1
Cb = ?
Va = 19.64 mL
Vb = 25.00mL
Solving for Cb
Cb = Ca Va / Vb
Cb = 0.208 * 19.64 / 25.0
Cb = 0.1634 molL-1 (Concentration of diluted ammonia solution)
Using the dilution equation;
C1V1 = C2V2
Initial Concentration, C1 = ?
Initial Volume, V1 = 25.00 mL
Final Volume, V2 = 250 mL
Final Concentration, C2 = 0.1634 molL-1
Solving for C1;
C1 = C2 * V2 / V1
C1 = 0.1634 * 250 / 25.00
C1 = 1.634 molL-1
C) the number of the pricipal energy level containing the outer electrons increases
Answer:
02 is a product
Explanation:
it doesnt take part in chemical reaction so its not reactant.02 doesnt alter rate of chemical reaction so it cannot be catalyst. it is gas it is not solid so it is a product.
The empirical formula of a compound that contain 22.6% nitrogen and 77.4% oxygen is calculated as below
calculate the moles of each element
= % composition/molar mass
that is
N(nitrogen) = 22.6/14= 1.61 moles
O(oxygen) = 77.4/16 = 4.84 mole
find the mole ratio by dividing each mole by the smallest mole ( 1.61 moles)
that is
N = 1.61/1.61 = 1
O = 4.84/1.61 = 3
therefore the empirical formula = NO3