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Aspirin is an organic acid with formula C8H7COOH and molar mass 180.16171 g/mol. A 1.30 g tablet is titrated with 0.1500 M HCl and the endpoint is reached at 22.17 mL. Calculate the mass percent of aspirin in the tablet. Watch significant figures.
what will be the equilibrium concentration of CO.
the same retention but different selectivity as what precentage of mixtures for acetonitrile/water and tetrahydrofuran/water?
A catalyst decreases the activation energy of a particular exothermic reaction by 59 kJ/mol, to 51 kJ/mol. Assuming that the mechanism has only one step, and that the products are 94 kJ lower in energy than the reactants
An aqueous solution containing 21.6 mg of vasopressin in 100.0 mL of solution has an osmotic pressure at 25.0 oC of 3.70 mmHg. What is the molecular weight of the hormone?
In the unbalanced reaction, Sn + HNO3 ---> Sn(NO3)2 + H2), 2.100 grams of Sn(NO3)2 was formed. How many grams of NO were formed and how many moles of HNO3 were reacted? (HINT: the coefficient of Sn is 3).
Calculate the energy in joules and calories lost when 10.0 gm ethanol, {C_2H_5OH}, cools from 62.5 0C to -46.0 0C?
carbon disulfide can b made by the reaction of carbon dioxide and sulfur trioxide 2so3(g) + Co2(g) + heat >
A vitamin C capsule is analyzed by tirating with 0.3M NaOH. It is found that 24.4 ml of base is required to react with a capsule weighing 0.55g.
Explain the following trends in lattice energy. (Select all that apply.) (a) NaCl > RbBr > CsBr CsBr is smaller than RbBr and NaCl. NaCl is smaller than RbBr and CsBr
The density of a 50% solution of NaOH is 1.525 g/mL. What volume of a solution that is 50% by weight NaOH is required to make 1 Liter of 0.15M NaOH solution.
How do you calculate the rate of change of absorbance per minute over the first 3 minutes to get units, U/ml, total units and percent recovery?
A 10.0-mL sample of a HCl solution has a pH of 2.000. What volume of water must be added to change the pH to 4.000?
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