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Chemistry
A solution is prepared by dissolving 3.50g of sodium hydroxide in water and adding water until the volume of the solution is 2.50L. What are the OH- and H3O+ concentrations?Write your answer using OH- and H3O+ identifying which you are calculating reporting three significant figures.
Chemistry
write down formation of the following triglycerides
1-stearlyl 2-oley 3-palmitylglyceride
1-stearlyl 2-oley 3-palmitylglyceride
Chemistry
Consider the cell reaction Zn(s)+Fe2+ (0.005M)↔Zn2+(0.01M) +Fe(s). Given
that the standard emf of the cell at 298K is 0.323 v, i) construct the cell ii)
Calculate emf of the cell.
that the standard emf of the cell at 298K is 0.323 v, i) construct the cell ii)
Calculate emf of the cell.
Chemistry
1. Determine the molarity of a solution containing 10.6g of sodium carbonate dissolve in
a)250cm³ of distilled water
b)500cm³ of distilled water
a)250cm³ of distilled water
b)500cm³ of distilled water
Chemistry
1.How many moles of molecules are there in
a)35.5g of chlorine molecules
b)160gof bromine molecules
2.Find the relative atomic mass of Y (L=6.0×10²³) particles per mole.An atom of a certain element Y has mass of 6.5×10²³g
how many molecules are there in
a)0.5moles of oxygen
b)0.15moles of chlorine molecules
c)2moles of nitrogen molecules
4.calc the no of molecules in a)16g of oxygen molecules
b)240g of bromine molecules
c)0.1g of hydrogen molecules
d)106g of chlorine molecules
a)35.5g of chlorine molecules
b)160gof bromine molecules
2.Find the relative atomic mass of Y (L=6.0×10²³) particles per mole.An atom of a certain element Y has mass of 6.5×10²³g
how many molecules are there in
a)0.5moles of oxygen
b)0.15moles of chlorine molecules
c)2moles of nitrogen molecules
4.calc the no of molecules in a)16g of oxygen molecules
b)240g of bromine molecules
c)0.1g of hydrogen molecules
d)106g of chlorine molecules
Chemistry
A solution of H2SO4 is standardized against a sample of
which has been previously found to contain 92.44? CaCO3 and
no other basic material. The sample weighing 0.7423 g is
treated with 42.42 mL of the acid and the excess acid then
requires 11.22 mL of NaOH solution. If 1.00 mL of the acid is
equivalent to 0.9976 mL of the NaOH, what is the N of each
solution?
which has been previously found to contain 92.44? CaCO3 and
no other basic material. The sample weighing 0.7423 g is
treated with 42.42 mL of the acid and the excess acid then
requires 11.22 mL of NaOH solution. If 1.00 mL of the acid is
equivalent to 0.9976 mL of the NaOH, what is the N of each
solution?
Chemistry
How many liters of hydrogen at STP can be produced from 28.0 g of zinc reacting with H2SO4?
Chemistry
When a chemist titrates a standard solution of 308.25 mL of nitric acid (HNO3) with 0.155 M potassium hydroxide (KOH) , she finds that it requires 246.6 mL of the base to reach the endpoint of the titration. What is the molarity of the acid solution ?
Chemistry
6.A gas occupies a volume of 400cm3 at 500k and 1 atmosphere pressure. What will be the temperature of the gas when the volumeand pressure of the gas is 100cm3and 0.5atmospheres respectively?(2 marks
Chemistry
calculate the average speed of a car if it traveled 180 km in 2.0 hr
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#339914 on Dec 2023
#339914 on Dec 2023