Answer is: mass of phosphorus is 37,16 grams.
m(C) = 36 g.
n(C) = m(C) ÷ M(C).
n(C) = 36 g ÷ 12 g/mol.
n(C) = 3 mol.
From balanced chemical reaction: n(C) : n(P) = 5 : 2.
n(P) = 2 · 3 mol ÷ 5.
n(P) = 1,2 mol.
m(P) = 1,2 mol · 30,97 g/mol.
m(P) = 37,16 g.
Answer:
pOH = 6.73
Explanation:
First, calculate pH = -log[H+] = -log(5.4 x 10^-8) = 7.27
pOH + pH = 14, so pOH = 14 - 7.27 = 6.73
Answer:
0.214 L
Explanation:
Step 1: Write the balanced equation
This is a single displacement reaction.
Zn(s) + 2 HCl(aq) ⇒ ZnCl₂(aq) + H₂(g)
Step 2: Calculate the moles corresponding to 0.625 g of Zn
The molar mass of Zn is 65.38 g/mol.
0.625 g × 1 mol/65.38 g = 9.56 × 10⁻³ mol
Step 3: Calculate the moles of H₂ produced from 9.56 × 10⁻³ moles of Zn
The molar ratio of Zn to H₂ is 1:1. The moles of H₂ produced are 1/1 × 9.56 × 10⁻³ mol = 9.56 × 10⁻³ mol.
Step 4: Calculate the volume occupied by 9.56 × 10⁻³ moles of hydrogen
Assuming standard pressure and temperature, 1 mole of hydrogen occupies 22.4 L.
9.56 × 10⁻³ mol × 22.4 L/1 mol = 0.214 L
Because of pollution from factories and other activities that release harmful gases into the air