Search & Filtering
Liquid heptane, C7H16, burns in oxygen gas to yield carbon dioxide and water. What mass of water is produced when 15.0 mL of heptane burns completely?
[Given: density of heptane = 0.6838 g/mL]
you bury a piece of copper-64 which has a half life of 3 days. 21 days later you dig up the piece of copper and after measuring the piece of copper you find it only has 4.5g lef. how much copler did you have when you buried it?
The transfer of a proton from butyric acid (stomach acid) to acetate can be described by the following reaction:
CH3 CH CH2 COOH + CH3COO− = CH3CH2CH2COO−+CH3COOH
Butyric acid+Acetate = Butyrate+Acetic acid
(a) The equilibrium constant for this reaction is K = 0.87, and Ka for acetic acid is 1.74*10−5. Using these values and Kw, compute the acid dissociation constant for butyric acid.
(b) Write the reaction and determine the value of Kb (the basicity constant) for butyrate.
(c) A solution is made by adding some acetic acid and some sodium butyrate to water. List all the species in the equilibrium solution that can act as acids, and rank them from most acidic to least acidic. Do the same for all species that can act as bases.
Determine the mass in grams of 6.65 × 10²¹ atoms of barium. (The mass of one mole of barium is 137.33 g.)
---------------------------------------------
3.2
Calculate the mass of NHACI that should be dissolved in 525.00 mL of 0.1531 M
NH3 (K = 1.8 x 105) solution to prepare a buffer with a pH of 10.00. Assume that
the change in volume on addition of NHaCI is negligible.
(8)
---------------------------------------------
QUESTIONN2
2.1. Calculate the pH of a Sr(OH)2 solution prepared by dissolving 0.3211 g of Sr(OH)2
(5)
and making up to 250.00 mL solution
2.2 Calculate the initial molar concentration of HF solution with a pH of 2.21.
(K= 1.5x 10-1)
(7)
aid of calculations, predict whether ammonia, NHs, will be formed or dissociate when
the mixture goes to equilibrium at 400
CaCOs (s) Ca0(s)+COz(g)
(2)
1.2. The reaction below was carried out at 503 K in a 5.00 L vessel. At equilibrium, the
reaction vessel contained 0.0185 mol of PCla, 0.0158 mol of PCs, and 0.0870 mol
of Cle. Calculate the value of Kc at this temperature.
Reaction: PCh (g) + Ch (g) PCs (g)
(6)
a gas occupies 7.84cm3 at 71.8kPa and 25 degree Celsius . find its volume at STP.
THE TEMPERATURE OF A GAS IN A SEALED CANISTER IS 350.0kPa AT A ROOM TEMPERATURE OF 150 DEGREE CELSIUS . THE CANISTER IS PLACED IN A REFRIGERATOR THAT DROPS THE TEMPERATURE OF THE GAS BY 20K. WHAT IS THE NEW PRESSURE IN THE CANISTER?
