Here are answers marked in dark below each question. I will give working in next 30 minutes.
1. One mole of carbon dioxide has a volume of 24 dm3 at room temp and pressure.
A reaction makes 33 600 dm3 of carbon dioxide at room temperature and pressure, how many moles of carbon dioxide are made?
2. One mole of oxygen molecules occupy a volume of 24 dm3 at room temp and pressure.
-0.0025 moles of oxygen are made in an experiment, calculate the volume that 0.0025 moles of oxygen molecules occupy at room temp and pressure:
24*0.0025 = 0.06dm^3
Number of moles = mass (g) ÷ molar mass (RFM)
How many moles are present in 34 grams of Cu(OH)2?
34/97.5 = 0.3487 moles
2. How much carbon dioxide is made, in grams, when 88g of propane is burned in oxygen?
C3H8 + 5O2 ---> 3CO2 + 4H2O
3. In the same reaction, how much water is made when 160g of oxygen is used to burn propane?
Number of moles = concentration x volume
You carry out a titration to neutralise sulphuric acid using:
• 25.0 cm3 of dilute sulphuric acid in the beaker
• sodium hydroxide solution of concentration 0.100 mol / dm3 in the burette.
The hydrochloric acid is exactly neutralised by 20.0 cm3 of this sodium hydroxide solution.
Look at the balanced symbol equation for the reaction.
Na2SO4 + H2OàNaOH + H2SO4
The number of moles of sodium hydroxide in 20.0 cm3 of a
0.100 mol /dm3 solution
b) The number of moles of sulphuric acid that reacted with this
amount of sodium hydroxide
c) The concentration, in mol / dm3, of the sulphuric acid.
0.04 moles per dm^3
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