Calculate the average volume in mL of HNO3 (aq) from trials I through III. * The diagram below shows the volume of HNO3(aq) added for each of three
titration trials
10 m
120 MLN
2.0 mil
130 ml
21
20 L
150ml
360 ml)
Initial)
burette
reading
Burette
reading
triali
Burette
reading
after trial 2
Burette
reading
athal
Note: The burette is not refilled after each trial.
Trial I
Trial II
23.9
Trial III
35.1
12.5
Final volume of HNO, (aq) (mL)
Initial volume of HNO, (aq) (mL)
1.2
12.5
23.9
Volume of HNO, (aq) added (mL)
11.3
11.4
11.2

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

How much carbon is stored in the atmosphere as co2

Concentrations expressed as a percent by mass are useful when the solute is a a. liquid b. gas c. solid