Answer:
pH = 0.81
Explanation:
HCl reacts with aniline, thus:
C₆H₅NH₂ + HCl → C₆H₅NH₃⁺ + Cl⁻
Moles of HCl are:
0.085L × (0.35mol HCl / L) = <em>0.02975mol HCl</em>
Moles of aniline are:
0.030L × (0.40mol HCl / L) = <em>0.012mol aniline</em>
Thus, after reaction, will remain:
0.02975mol - 0.012mol = <em>0.01775mol HCl</em>
Moles of HCl in solution are equal to moles of H⁺, thus, moles of H⁺ are: <em>0.01775mol H⁺</em>
As total volume is 85.0mL + 30.0mL = 115.0mL ≡ <em>0.115L</em>
0.01775mol / 0.115L = 0.1543M
pH of solution = -log[H⁺]
pH = -log 0.1543M
<em>pH = 0.81</em>
<em></em>
Answer:
C rusting iron
Explanation:
water evaporating and melting is an example of physical change it doesn't change the H2O composition of the atoms, rubbing water on paper doesn't change any atoms or molecules. so the only answer that leaves is rusting iron because when an iron nail comes into contact with water and is then exposed to the air, it rusts, forming a brown-red substance. This process changes the chemical composition of the original substance.
Calculate the mass in grams of hydrogen chloride (HCl) that is formed when 5.6 L of molecular hydrogen, measured at TPE, reacts with an excess of gaseous molecular chlorine. MHCl = 36.5 g/mol
H2(g) + Cl2(g) → 2HCl(g)
Answer:
18.25g
Explanation:
The reaction equation is given as;
H₂ + Cl₂ → 2HCl
Given parameters:
Volume of hydrogen gas = 5.6L
The reaction occurs at STP.
Solution:
To solve this problem, let us find the number of moles of the hydrogen as;
At STP;
22.4L of a gas has 1 mole;
5.6L of Hydrogen as will have 
= 0.25mole
From the balanced reaction equation;
1 mole of H₂ will produce 2 mole of HCl
0.25 mole of H₂ will produce 2 x 0.25 = 0.5mole of HCl
The mass of HCl';
Mass of HCl = number of moles x molar mass
Mass of HCl = 0.5 x 36.5 = 18.25g
In aqueous solutions, soluble salts will dissociate into
ions. Since all salts of nitrates are completely soluble in water, AgNO3 and
KNO3 will dissociate into Ag+, K+, and NO3- ions. KBr is also soluble in water,
forming K+, Br- ions.
Rewriting the equation:
Ag+ + NO3- + K+ NO3- -> K+ + NO3- + AgBr(s)
Spectator ions are those that does not participate in the
reaction, which means they are found in both sides in the equation above. K+
and NO3- are those ions.
<h3>Answer:</h3>
5 Moles of Carbon Atoms
<h3>Explanation:</h3>
As we know one molecule of Methane is made up of one atom of Carbon and four atoms of Hydrogen. Also, we can say that one mole of CH₄ contains one mole of Carbon atoms and four moles of hydrogen atoms. Therefore, as,
1 mole of CH₄ contains = 1 mole of Carbon Atoms
Then,
5 moles of CH₄ will contain = X moles of Carbon Atoms
Solving for X,
X = (5 moles × 1 mole) ÷ 1 mole
X = 5 Moles of Carbon Atoms
