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Superphosphate, or sometimes called triple phosphate, is a commonly used water-soluble fertilizer. It is produced by the reaction:
What volume of 0.558 M
How many millilitres of 6.0 M HNO3 would you add
to 300 mL of a buffer solution that is 0.250 M
CH3COOH and 0.560 M NaCH3COO to change the
pH from 5.09 to 5.03? Ka of acetic acid, CH3COOH,
is 1.8 × 10-5
.
to 300 mL of a buffer solution that is 0.250 M
CH3COOH and 0.560 M NaCH3COO to change the
pH from 5.09 to 5.03? Ka of acetic acid, CH3COOH,
is 1.8 × 10-5
.
The amount of CO2 in the ocean is approximately 280 ppm. What is the mole fraction of CO2 in a liter of ocean water?
1. A compound of carbon, Hydrogen, Nitrogen and Oxygen was analyzed. Its chemical composition was determined as follow: 49.5% C, 5.2% H, 28.8% N and 16.5% O.
(a) Determine the empirical formula of the compound.
(b) If 0.050 mol of the compound referred to in (a) weight 9.71 g. Find the molecular mass of the compound.
(c) Workout the molecular formula of the compound.
(a) Determine the empirical formula of the compound.
(b) If 0.050 mol of the compound referred to in (a) weight 9.71 g. Find the molecular mass of the compound.
(c) Workout the molecular formula of the compound.
gold has a density of 19.3 g/mL. if you have 4.0 grams of gold, what is the volume of the sample?
An engineerAn engineer is travelling for a vacation using his car. He noticed that his current speed is consuming more fuel than the average. He decided to cut his speed from 90km/h to 60km/h to "conserve fuel" thereby cutting the fuel consumption as well from 2.5 US gal/h to 1 US gal/h. How many liters of fuel will be saved in a 100-ml trip?
When 10g of a mixture of potassium chloride and anhydrous sodium sulphate is dissolved in water and excess barium chloride solution added, 6.9g of barium sulphate is precipitated. Calculate the composition of the mixture
Reasons why polypropylene suitable use in microwavable
Richards and Willard determined the molar mass of lithium and collected the following data.6
Experiment
Molar mass, g/mol
1
6.9391
2
6.9407
3
6.9409
4
6.9399
5
6.9407
6
6.9391
7
6.9406
(a) Find the mean molar mass determined by these workers.
(b) Find the median molar mass.
(c) Assuming that the currently accepted value for the molar mass of lithium is the true value, calculate the absolute error and the percent relative error of the mean value determined by Richards and Willard.
Experiment
Molar mass, g/mol
1
6.9391
2
6.9407
3
6.9409
4
6.9399
5
6.9407
6
6.9391
7
6.9406
(a) Find the mean molar mass determined by these workers.
(b) Find the median molar mass.
(c) Assuming that the currently accepted value for the molar mass of lithium is the true value, calculate the absolute error and the percent relative error of the mean value determined by Richards and Willard.
