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Define a sample of Fe-59 initially registers 125 counts per second on a radiation counter. After 10 days the sample registers 107 counts per second. Define what is the half life in days of Fe-59?
It takes 485 J of energy to raise the temperature of 104.1 g mercury from 20.0°C to 53.5°C. Calculate the specific heat capacity and the molar mass capacity of mercury.
The density of air at ordinary atmospheric pressure and 25 0C is 1.19 g/L. What is the mass of air, in kg, in a room that measures 12.5 ft by 15.5 ft by 8.0 ft?
what does this chemical formula mean? can you break it down bit by bit?4kalsi3o8 4h 2h2o 4k al4si4o10oh8
The reaction: 2 HI → H2 + I2, is second order and the rate constant at 800 K is 9.70 × 10-2 M-1 s-1. How long will it take for 8.00 × 10-2 mol/L of HI to decrease to one-fourth of its initial concentration.
Given the following thermochemical equations, C2H2(g) + 5/2 O2(g) -----> 2CO2(g) + H2O(l) enthalpy = -1299.5 kJ
The ammonia gas is produced by reacting hydrogen gas with nitrogen gas. How to produce 856 g of ammonia gas using air as your source of nitrogen gas, define what volume of air is needed if the air is introduced at 27°C and 760 mmHg?
the Fischer esterification experiment why was the majority of the ethanol boiled off prior to extraction and why was the reaction vial cooled
Neglect activity and assume that neither Hg2+ nor SCN- react significantly with water (no formation of HgOH+ or HSCN). Hint: you will probably want to make an assumption in the charge balance to simplify the problem and then test to see if the ass..
The percent composition (by mass) of a compound is 40.0% carbon, 53.0 % oxygen and the rest is hydrogen. Find the empirical formula of the compound.
Maintenance of pH is vital to the cells of all living organisms because enzyme activity is influenced by pH. What is the intracellular pH range of most cells?
Calculate the ph at the equivalence point for the following titration 0.20M HCl versus 0.20M methylamine (CH3NH2). The Ka of methylammonium is 2.3x10^-11.
what is the form of the integrated rate law which will produce a straight line if the reaction shown in the equation (dye(aq)+NaOCl(aq) ---> colorless products (aq)) is 0th order with respect to [dye]? 1st order with respect to [dye]? 2nd order wi..
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