Using your calculated concentration of NaOH from lab how many
grams of KHP would you need to start with in order to have an end
point at 35.00 mL?
Do I use 71.08 or 204.22 for KHP Molecular Mass? Concentration
of NaOH from the Experiment was .356.
1) How many grams of dry NH4Cl need to be added to 2.40 L of
a 0.800 M solution of ammonia, NH3, to prepare a buffer solution
that has a pH of 8.82? Kb for ammonia is 1.8 x 10^-5.
2) A beaker with 150 mL of an acetic acid buffer with a
pH of 5.000 is sitting on a benchtop. The total molarity of acid
and conjugate base in this buffer is 0.100 M. A student adds 6.80
mL...
The molecular weight of anhydrous calcium chloride is 110.99
grams/mol. How many grams do you need for 750 ml of 250uM calcium
chloride?
2. Ethanol is supplied in a 90% solution. You need 275 mL of 75%
Ethanol for your experiment. How would you make this solution?
3.You have 12 mL of cells you need to treat with Hydrogen
Peroxide (H2O2), such that the final
concentration of H2O2 is 50 uM. How much of a
30 mM stock solution of...
You have 67 grams of a unknown material, and you would
like to find out its specific heat. You decide to heat it up to 100
C and put it in a 66 g aluminum cup (specific heat = 0.22 cal/(g C)
that 200 grams of water (specific heat = 1 cal/(g C)). Usually this
aluminum cup is in another cup so that the system is insulated. If
both the cup and the aluminum cup are initially at 20 C,...
1. Assuming stomach acid is 0.1M HCl, how many grams of stomach
acid would have been neutralized by your tablet? (use the average
value)
2. Did the tablet neutralize at least 47 times its weight in
stomach acid? ( use the average mass of your tablet)
show calculations
Average mass of tablet =2249.67mg and Average mass of Antacid =
807.33mg
Average mol of Antacid = 0.00807 and molar mass of antacid =
171.346
1-
How many grams in 2.5 of CO2?
2- How many moles are in 90 grams of C6H12O6?
3 - How many grams of hydrogen are in 2 moles C3H8
4- Identify the groups and period that each elements belongs
:
Silicon
Barium
Element number 21
Iodine
5 - What is the maximum electron number that can be contained
in following:
A 2s orbital
The 3p subshell
The third shell
A 4d orbital
6 - How many valence electrons are...
1)How many moles of Sr are there in
93.2 grams of Sr?
2)How many grams of Ag are there in
0.692 moles of Ag?
3)How many grams of Ga are there in a sample of
Ga that contains the same number of moles as a
39.1 gram sample of Mg? grams of
Ga