Lap 8
Find the molar mass of K2O
What is 94.2 g/mol
Define stoichiometry
The calculation of amounts of reactants and products in chemical reactions
Convert 45 degrees Celsius to Kelvin
318 K
Define exothermic.
Define solute and solvent
Solute = substance dissolved
Solvent = dissolving substance
How many moles are in 88 g of CO2
What is 44.0 mols
How many moles of NH3 are produced from 6.0 mol H2
What is 4.0 mol NH3
Convert 625 K to Celsius
352 degrees C
What type of reaction would it be if it releases 250 kJ?
Exothermic
3 ways to increase dissolving rate
Stirring, increasing temperature, crushing solute
How many atoms are in 3.0 moles of helium?
What is 1.8 x 1024 atoms
How many grams of H20 area produced produced from 4.5 moles O2?
162 g H20
A gas occupies 3.0 L at 1.0 atm. What is the volume at 2.0 atm?
1.5 L
Define specific heat capacity
The amount of heat needed to raise 1 gram of substance by 1 degree Celcius
85 g dissolved when only 70 g should dissolve.
Supersaturated
How many grams are in 4.2 moles of MgO?
What is 169.3 g
How many molecules of CO2 are produced from 12 g C?
1 mol
A gas occupies 1.8 L at 250 K. What volume will it occupy at 400 K if pressure stays constant?
2.9 L
How much heat is needed to raise 60.0 g water from 15 degrees C to 35 degrees C?
5.02 x 103 J
Percent composition of oxygen in H2O
What is 88.9% oxygen
How many grams of Fe2O3 area produced produced produced from 25.0 g Fe?
35.8 g
A gas has a pressure of 1.5 atm at 300 K. What will the pressure be at 450 K if volume remains constant?
2.25 atm
A 45.0 g metal sample absorbs 900J of heat and changes temperature from 20 degrees C to 50 degrees C. Find specific heat.
0.667 J/g degrees C