A sample contains a mixture of 239Pu and
240Pu in unknown proportions. The activity of the mixed
sample was found to be 4.35 x 107 dpm for a sample of
0.125 mg of Pu. Calculate the weight % of each Pu isotope
present
What volume, in mL, of a 0.2089 M KI solution
contains enough KI to react exactly with the
Cu(NO3)2 in 43.88 mL of a 0.3842 M solution
of Cu(NO3)2?
2Cu(
NO3)2+4KI-----2CuI+I2+4KNO3
A sample of a gas mixture contains the following quantities of
three gases.
compound
mass
CO
2.68
g
CO2
3.69
g
SF6
2.13
g
The sample has:
volume = 2.50 L
temperature = 16.6 °C
What is the partial pressure for each gas, in mmHg?
What is the total pressure in the flask?
CO ___ mmhg
CO2 __mmhg
SF6 ____ mmHg
total ___ mmHg
Determining Unknown Quantities Determine the unknown quantity
for each of the following independent situations using the
appropriate interest tables: (Click here to access the FV and PV
tables to use with this problem.) Nancy and Jeff want to start a
trust fund for their newborn son, Mark. They have decided to invest
$5,000 today. If interest is 8% compounded semiannually, how much
will be in the fund when Mark turns 20? Round your answer to the
nearest dollar. $ Nixon...
A 7.81 g sample of an aqueous solution of
nitric acid contains an unknown amount of the
acid.
If 23.2 mL of 1.68 M
potassium hydroxide are required to neutralize the
nitric acid, what is the percent by mass of
nitric acid in the mixture?
A 9.15 g sample of an aqueous solution of hydroiodic acid
contains an unknown amount of the acid. If 29.3 mL of 0.506 M
sodium hydroxide are required to neutralize the hydroiodic acid,
what is the percent by mass of hydroiodic acid in the mixture?
Please explain how: A sample contains MgNH4(PO4)2, Sb2S3, KBr,
Cr(OH)3, and PbCl2. Identify the soluble ions after the addition of
6 M HCl; then H2S and 0.2 M HCl; then OH- to a pH of 8; and then
(NH4)2HPO4 with NH3. Explain. a.) Sb2S3 b.) KBr c.) PbCl2 d.)
Cr(OH)3 e.) MgNH4(PO4)2
An unknown compound contains only carbon, hydrogen, and oxygen.
Combustion analysis of a 1.893 gram sample of the compound produced
5.545 grams of carbon dioxide and 1.388 grams of water. The
1.893-gram sample contained 7.002 x 10-3 moles. What is the
molecular formula for this compound?