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A 26.1 g sample of pure iron at 77°C is dropped into 93 g of water at 17°C. What is the final temperature of the water-iron mixture?
Exactly 50.0ml solution of Na2CO3 was titrated with 65.8ml of 3.00M HCl. If the specific gravity of the Na2CO3 solution is 1.25, what percent by weight of Na2CO3 does it contain?
The reaction of barium metal with liquid water produces 660.2 kJ of heat for every mole of barium that reacts. One of the products is barium hydroxide. Calculate the amount of heat associated with 3
What is specific heat of a 19g metal object heated to 96 degrees C then added to a calorimeter containing 75g of water at 18 degrees C. Final temperature is 22 degrees C? What is the metal?
A thermos contains 143 cm3 of coffee at 90 C. To cool the coffee you drop 2 13.0-g ice cubes into the thermos. The ice cubes are initially at 0 C and melt completely. What is the final temperature o
How much heat is required to heat 10.0g of ice at -5.00 degree Celsius to become water vapor at 107.00 degree Celsius?
which of the following ionic compounds would have the most negative lattice energy: nacl, kcl, or mgcl2. Explain your answer.
A zero-order reaction has a constant rate of 3.20×10-4 M/s. If after 60.0 seconds the concentration has dropped to 9.00×10-2 M, what was the initial concentration?
Two cars lost in a blinding snow storm are traveling across a large field, each thinking they are on the road. They collide. If the distance x is 161 meters and the car on the left is travelling at
Initially a container contains 0.60 M HI, 0.038 M H2, and 0.15 M I2 at equilibrium. What is the new equilibrium concentration of H2, if the H2 concentration is increased by 0.299 M?
The circular top of a can of soda has a radius of 0.018 m. The pull-tab has an area of 2.03 10-4m2. The absolute pressure of the carbon dioxide in the can is 1.4 105Pa. Find the force that this gas
Discuss the differences observed in the IR and NMR spectra of 3-nitrophthalhydrazide and luminol that are consistent with reduction of the nitro function to an amino group in this experiment (synth
certain anesthetic contains 64.9% C 13.5% h and 21.6% O by mass. at 120 degrees celsius and 750 mm hg, 1 l of the gaseous compound weighs 2.3g what is the molecular formula of the compound'
In about 200 words, outline the issues that a user might encounter when using a web browser on a smart phone to view a web page. explain what a web designer might do to address those issues.
The normal boiling point of the solution is 61.51?C, the normal boiling point of CCl4 is 61.2?C. The boiling point constant for CCl4 is 4.95 K · kg/mol. What is the molar mass of the compound
An airtight box has a removable lid of area 1.1 10-2m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 0.75 105Pa. The inside of the box is completely
A student found that her mixture contained 6% NH4Cl, 29% NaCl, and 75% SiO2. Assuming that her weighing and calculations were correct, what was the possible source of error in her experiment?
Suppose that ammonia (a monoprotic base), applied to a field as a fertilizer, is washed into a farm pond containing 3.0 × 106 L of water. If the pH of this pond is found to be 9.81, what volu
Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 2.2 1028 kg and 2.0 103 m. (a) Find the density of such a star.
How many moles of oxygen are needed to react completely with 2.20×10^24 molecules of acetylene?
Show the mechanism that forms the three products. Predict the major and minor products. Explain your choices.
Calculate the pH at the halfway point and at the equivalence point for each of the following titrations. (a) 100.0 mL of 0.30 M HC7H5O2 (Ka= 6.4 multiplied by 10-5) titrated by 0.30 M NaOH.
The system CO2(g) + H2(g) - > H2O(g) + CO(g) is at equilibrium at some temperature. At equilibrium a 4.00 L vessel contains 1.00 mole CO2, 1.00 mole H2, 2.40 moles H2O, and 2.40 moles CO. H
Which reagent or test could you use to distinguish between ethynylbenzene and vinylbenzene