Caffeine molecules
How many grams of caffeine (C8H10N4O2) are present in one cup of coffee that contains 8.98 × 1021 caffeine molecules?
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A 155 gram sample of copper was heated to 150 degrees Celsius then placed into 250 gram of water at 19.8 degrees Celsius. Calculate the final temperature of the mixture.
A 12 kN force is exerted on a rocker arm. The moment of inertia (I) of the crosssection with respect to the neutral-axis is 43.3x10-9 m4.
A spring has a natural length of 26 cm. If a 26 N force is required to keep it stretched to a length of 30 cm, how much work W is required to stretch it from 26 cm to 37 cm? (Round your answer to the nearest hundredth.)
How many liters of water can be made from 55g of oxygen gas & an excess of hydrogen at a pressure of 12.4 atm & a temp of 85 degrees C?
What is the value of the equilibrium constant for the neutralization of acetic acid with sodium hydroxide? The Ka for acetic acid is 1.8 x 10-5.
A reaction has an activation energy of 123 kJ/mol and a rate constant of 0.200 s-1 at 311K. At what temperature will the rate constant be double that at 311 K?
Suppose that 3 J of work is needed to stretch a spring from its natural length of 26 cm to a length of 42 cm. (a) How much work W is needed to stretch the spring from 39 cm to 43 cm? (Round the answer to the nearest hundredth.)
When silver metal reacts with bromine at 298 k, a spntaneous redox reaction takes place. calculate E initial and calculate the wquilibrium constant.
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