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Initial: CaCl2•2H2O (g) 1 gram Initial: CaCl2•2H2O (moles) .0068 moles Initial: CaCl2 (moles) .009 moles Initial: Na2CO3 (moles) .0068 Initial: Na2CO3 (g) 0.72 moles Theoretical: CaCO3 (g) 0.60 grams Mass of Filter paper (g) 1.04 grams Mass of Filter Paper + CaCO3 (g) 1.82 grams Actual: CaCO3 (g) 0.78 % Yield:
What is the percentage yield?
Problem- What is the pH of a solution that is 0.30 M in acetic acid, HC2H3O2, and 0.70 M in sodium acetate, NaC2H3O2, at 25 degrees C.
if a procedure calls for 26.0 ml of concentrated hcl what are the mass and moles of hcl actually used in the
3 tons of ethanol are accidentally discharged into a lake. By how much is the biological oxygen demand of this water increased? Assume that all ethanol is transformed into CO2 and assume the lake contains 108 liters of water.
Problem- A volume of 80.0mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 21.7mL of 1.50 M H2SO4 was needed
The solubility product of Mg (OH)2 is 1.2x10-11. Explain what minimum OH- concentration must be attained (for example, by adding NaOH) to make theMg2+ concentration in a solution of Mg(NO3)2 less than 1.0 x10-10M
Calculate the pressure when the volume is 1.27 L and the temperature is 3.00 × 102 K.
Referring to Fig. 6.12, indicate over how many squares the sound waves would spread for r 5 m. The sound intensity would decrease to what fraction in value?
Suppose that a linear Li6 molecule could be formed by combining the 2s orbitals on each atom into delocalized MOs. What is the predicted bond order of the molecule as a whole
Arrange the subsequent aqueous solutions in order of rising freezing points(lowest to highest temperature): 0.10m glucose, 0.10m BaCl2 , 0.20m NaCl, and 0.20m Na2SO4
If there is a DBL bond do we always start on one with it even though the other bonds will be a higher number? and is that the same for triple bonds over dbl bonds
the structure they gave me already has two nonbonding electrons on Bromine with no formal charge
A 64gram piece of ice at 0 celsius is added to a sample of water at 9 celsius. All of the ice melts and the temperature of the water decreases to 0 celsius. how many grams of water were in the sample?
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