what is the density of He, O2,, c3H8 and SF6 at STP Write the molecular formula

Question

what is the density of He, O2,, c3H8 and SF6 at STP Write the molecular formula for the following compounds. Iron (III) chloride Silicon tetrafluoride Magnesium bromide Phosphorous pentaiodide Calcium oxide Barium sulfate Nickel (II) chloride hexahydrate Titanium (IV) chloride What is the density of He, O_2, C_3 H_5 and SF_6 gas at STP (assume an ideal gas)? Bonus- Why does your voice go up in pitch when you inhale He? How do you expect the pitch voice to change if you inhale SF_6? Why? A sample of gas is collected at 25 degree C and has a volume of 125 ml. What will be the volume at 0 degree C?

Explanation / Answer

Ideal gas equation,

P V = n R T
(OR)
P V = (m/M) R T
P = (m/V) (R T / M)
P = d R T / M

d = M P / R T

At STP,

P = 1 atm

T = 273.15 K

R = 0.0821 L.atm.K-1.mol-1
Case(1):- He

M = 4 g/mol

So, d = 4 * 1 / (0.0821 * 273.15) = 0.178 g/L

Case(2) : -

Molar mass of O2, M = 32 g/mol

d = 32 * 1 / (0.0821 * 273.15) = 1.43 g/L

Case(3) : -

Molar mass of C3H8, M = 44 g/mol

d = 44 * 1 / (0.0821 * 273.15) = 1.96 g/L

Case(4)

Molar mass of SF6, M = 146 g/mol

d = 146 * 1 / (0.0821 * 273.15) = 6.51 g/L

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.