Search & Filtering
An iron wire weighs 2.225g. It’s dissolved in an acid which oxidizes to Fe2+ and made up of 250cm3. A 25cm3 of sample required is 31cm3 of a 0.0185mol L-1 solution of potassium dichromate in a titration.
- Calculate the number of moles of potassium dichromate used in the titration?
- Determine number of moles of iron present in the 250cm3 iron wire solution?
- Calculate mass of iron present in the iron wire?
- Calculate percentage of iron present in the iron wire?
An iron weighs 2.225g. It’s dissolved in an acid which oxidizes to Fe2+ and made up of 250cm3. A 25cm3 of sample required is 31cm3 of a 0.0185mol L-1 solution of potassium dichromate in a titration.
Calculate the number of moles of potassium dichromate used in the titration?
Or
Describe the graph that could be drawn, which should include the following: What is the label on the vertical axis of the graph, include units?
What is the label on the horizontal axis of the graph?
Describe the pattern expected in the graph
To calculate the entropy change of the system for the combustion of one mole of methane gas at 298K. Standard entropies at 298K are as follows:
S⁰(CO₂)=213.7JK⁻¹
S⁰(H₂O)=69.9JK⁻¹
S⁰(CH₄)=186.3JK⁻¹
S⁰(O₂)=205.1JK⁻¹
Also calculate the entropy change of surroundings if the molar enthalpy of combustion of methane is -8.9×10⁵Jmol⁻¹
1) 89.3 Joules of heat is required to raise the temperature of 10.0 grams of copper by 100 degrees celsius . Calculate the heat capacity of copper?
2) 88.2 Joules of heat raises temperature of 45.8 grams lead by 15.0 degrees celsius. Calculate the specific heat capacity of lead?
Calculate the amount of calcium chloride (MW = 147.02 g/mol) required to make a 20 mM solution in the 500 ml of a 200 mM triethanolamine
#339914 on Dec 2023