Engineering Board Exam Reviewer · Chemistry · hard
A container holds 8 g of helium (He = 4) and 16 g of oxygen ( O2 = 32) at a total pressure of 3 atm. What is the partial pressure of helium?
- 2.4 atm
- 1.0 atm
- 1.5 atm
- 0.6 atm
Answer
A. 2.4 atm
Solution
n He = 2 mol, n O2 = 0.5 mol. y He = 2/2.5 = 0.8. P He = 0.8(3) = 2.4 atm.
More Chemistry questions
- What mass of oxygen gas is contained in a 10 L tank at 5 atm and 27 ° C? (R = 0.08206 L· atm/mol· K, O = 16)
- How many sigma ( ) and pi (π ) bonds are in an acetylene molecule (H-C C-H)?
- Which of the following is a weak electrolyte?
- What is the normality of a solution containing 4.9 g of H2SO4 in 1 L of solution? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl…
- A solution has [H+] = 1 × 10-3 M at 25 °C. What is its pOH?
- How many grams of H2SO4 are in 500 mL of a 0.1 M solution? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)
- How many moles of ions are produced when 1 mol of CaCl₂ dissolves completely in water?
- A gas occupies 500 mL at 27 °C and 1 atm. What volume will it occupy at 127 °C and 2 atm? (use K = ° C + 273)
- Chlorine consists of 75.77% 35Cl (34.969 u) and 24.23% 37Cl (36.966 u). What is its average atomic mass?
- What is the density of carbon dioxide at STP? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)