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Hi.
Can you show an example of the chain reaction of CH4 + O2?
0.500 M HCl, also at 35.00ᵒC. After stirring, the final temperature is 37.21ᵒC. [Assume the total
volume is the sum of the individual volumes and that the final solution has the same density (1.00
g/mL) and specific heat capacity as water (4.184 J/g.K).
(a). Calculate the qsoln (in J and kJ)
(b) Calculate the change in enthalpy, ∆H of the reaction (in kJ/mol of water formed).
(a) Explosive decomposition of dynamite: liquid nitroglycerine (C3H5N3O9) explodes to produce a
mixture of gases – carbon dioxide, water vapor, nitrogen and oxygen.
(b) The reaction that takes place in a self-contained breathing apparatus: solid potassium
superoxide (KO2) reacts with carbon dioxide gas to produce oxygen gas and solid potassium
carbonate.
(c) The production of iron from its ore in a blast furnace: solid iron (III) oxide reacts with carbon
monoxide gas to produce solid iron metal and carbon dioxide gas.
chocolate. Elemental analysis of caffeine shows 49.47 mass % C, 5.19 mass % H, 28.86 mass % N
and 16.48 mass % O. What is the molecular formula of caffeine?
why does filter paper don't lose its integrity as compared to paper when it is exposed to water?
For the reaction, Cl2(g)+2NO(g) 2NOCl(g), the initial concentrations, [Cl2]0 and [NO]0 are given below along the corresponding with initial rates. (5) [Cl2]0/M [NO]0/M Initial rate/Ms-1 0.10 0.10 3.010-3 0.20 0.10 6.010-3 0.20 0.20 2.410-2 Determine (i) the rate constant.
If a health person's kidneys can filter 125 mL of blood per minute, then how long will it take for the kidneys to filter 4.5 L of blood?
How many grams of barium nitrate, Ba(NO3)2, must be dissolved to prepare 500. mL of a 0.169 M aqueous solution of the salt?
35 g of histidine is dissolved in 260 mℓ
mℓ of distilled water to give a solution with a final volume
of 264. mℓ
mℓ. The relative molecular weight of histidine is 155.2. Give answers to at least 3 significant figures.
(a) What is the concentration in %(w/v)?
Answer = %(w/v)
(b) What is the concentration in M ?
Answer = M
(c) What is the concentration in %(w/w)? (Assume that 1 mℓ
mℓ of water weighs 1 g).
Answer = %(w/w)
An experiment requires 250 mℓ of a 80 μM solution of potassium chloride. A stock solution
of concentration 45 mM is available. What volume of stock solution should be used? Your
answer should be expressed in μℓ to at least 3 significant figures.
