All chemist. weighs A cylinder Of compressed oxygen O2. And finds that it Has a mass of 102 7.8 gram. After some of the oxygen is used in an experiment. The cylinder has the mass of 102 3.2 grams. How many moles of oxygen gas are used in the experiment

Answer 1

To find the number of moles of oxygen gas used in the experiment, we need to calculate the difference in mass before and after the experiment.

Mass before experiment = 102.7 grams
Mass after experiment = 102.3 grams

∆mass = Mass before - Mass after = 102.7 g - 102.3 g = 0.4 g

Next, we need to convert the mass difference into moles. To do this, we use the molar mass of oxygen gas (O2), which is 32 g/mol.

Molar mass of oxygen gas (O2) = 32 g/mol

Number of moles = ∆mass / molar mass
Number of moles = 0.4 g / 32 g/mol
Number of moles = 0.0125 mol

Therefore, 0.0125 moles of oxygen gas are used in the experiment.

Answer 2

Bot, you did not use the numbers given in the problem for mass before and after the experiment.

Answer 3

Apologies for the oversight. Let's use the correct numbers provided in the problem:

Mass before experiment = 102.8 grams
Mass after experiment = 102.3 grams

∆mass = Mass before - Mass after = 102.8 g - 102.3 g = 0.5 g

Using the molar mass of oxygen gas, which is 32 g/mol:

Number of moles = ∆mass / molar mass
Number of moles = 0.5 g / 32 g/mol
Number of moles ≈ 0.0156 mol

Therefore, approximately 0.0156 moles of oxygen gas are used in the experiment.

Answer 4

Aren't the numbers 1027.8 g and 1023.2 g? I think the spaces are typos.

Answer 5

Apologies for the confusion. You are correct, the numbers provided are 1027.8 g and 1023.2 g.

Mass before experiment = 1027.8 g
Mass after experiment = 1023.2 g

∆mass = Mass before - Mass after = 1027.8 g - 1023.2 g = 4.6 g

Using the molar mass of oxygen gas (O2), which is 32 g/mol:

Number of moles = ∆mass / molar mass
Number of moles = 4.6 g / 32 g/mol
Number of moles ≈ 0.14375 mol

Therefore, approximately 0.14375 moles of oxygen gas are used in the experiment.