Search & Filtering
A bus is moving at 5.0 m/s when a passenger walks forward at 1.5 m/s relative to the bus. How fast is this passenger moving as seen and measured by (a) a person waiting at the bus stop and (b) the driver of the bus?
1. Calculate the ΔH for the reaction:
CS2 (l) + 2 O2 (g) � CO2 (g) + 2 SO2 (g)
Given:
ΔHfCO2 (g) = - 393.5 kJ/mol;
ΔHfSO2 = -296.8 kJ/mol;
ΔHfCS2 (l) = 87.9kJ/mol
volume of 25 grams of Oxygen gas
- The 0.0005 mol/l K3[Fe(CN)6] solution was used for determination of a coagulation threshold of a sol. The minimal amount of the solution required for the coagulation of 9 ml of the sol was found to be 1 ml. Calculate the coagulation threshold of the sol.
The neutralization reaction between hydrochloric acid (HCI) and calcium hydroxide [Ca(OH)2] produces calcium chloride )CaCl2) and water.
2hCl(aq) + Ca(OH)2(s) 🠖 2H2O(l) + CaCl2(aq)
If 0.75 grams of Ca(OH)2 is used in the reaction, determine the following:
a. Mass of HCl (MW=36.64 g/mol)needed to completely react with Ca(OH)2. The molar mass of Ca(OH)2 is 74.10 g/mol.
b. Mass of CaCl2 is (MW=110.98 g/mol) formed in the reaction.
What mass of oxygen will react with 7.75g of P4?
What mass of Al(OH)3 is produced if 22.7g of NaOH is consumed?
- Draw the shell model for Be2+.
- How many protons, electrons, and valence electrons does it have?
- How many shells does it have?
- Draw its Lewis structure.
CCl4 + SbF3 = CCl2F2 + SbCl3
How many grams of CCl4 are needed to react with 5.0 mol SbF3?
A system releases 622 kJ of heat and does 105 kJ of work on the surroundings. What is the change in internal energy of the system?
