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Science Clinic => Chemistry => Topic started by: pepyto on Nov 18, 2019

Title: How many litres of oxygen are needed to exactly react with 19.8 g of methane at STP? CH4(g) + 2O2(g) ...
Post by: pepyto on Nov 18, 2019

Question 1

The mole fraction of oxygen in dry air near sea level is 0.20948. The concentration of oxygen is ________ molecules per litre, assuming an atmospheric pressure of 0.985 bar and a temperature of 29.5 °C.
◦ 3.75 × 1024
◦ 4.94 × 1021
◦ 5.07 × 1022
◦ 6.23
◦ 0.00819

Question 2

How many litres of oxygen are needed to exactly react with 19.8 g of methane at STP?

CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

◦ 27.8 L
◦ 60.5 L
◦ 13.9 L
◦ 56.0 L

Title: How many litres of oxygen are needed to exactly react with 19.8 g of methane at STP? CH4(g) + 2O2(g) ...
Post by: jessicaduplan on Nov 18, 2019

Answer 1

4.94 × 1021

Answer 2

56.0 L