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?
33600/24=1400 moles 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
264 gms 3. In the same reaction, how much water is made when 160g of oxygen is used to burn propane?
72 gms 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 Calculate The number of moles of sodium hydroxide in 20.0 cm3 of a 0.100 mol /dm3 solution
0.002 moles b) The number of moles of sulphuric acid that reacted with this amount of sodium hydroxide
0.001 moles c) The concentration, in mol / dm3, of the sulphuric acid.
0.04 moles per dm^3
Kindly give rating to these answers. BONUS and POSITIVE feedback will be appreciated.