Help with lab equation regarding atomic mass

Initial temp. of 100 gm of Fe: 20 degrees Celsius Final temp. of 100 gm of Fe : 100 degrees Celsius Initial temp. of 250 ml of water: 20 degrees Celsius Final temp. of 250 ml of water: 25 degrees Celsius 1. Find the estimate of the specific heat for the metal. (use 1 cal/gm *C for water) 2.Estimate the atomic weight ...continues

Which one is Acidic or basic or neutral?

Will 0.10 M aqueous solutions of the following salts be acidic ("A"), basic ("B") or neutral ("N") (Assume a solution is neutral if its pH is 7.00 plus or minus 0.05). A. disodium hydrogen citrate B. sodium dihydrogen citrate C. sodium sulfate D. ammonium dihydrogen phosphate E. ammonium cyanide F. ammonium hydrosu ...continues

What is the molarity of the solution? (i.e. [HA]+[A-].)

An aqueous solution of a monoprotic acid ("HA"; Ka = 3.82à—10-1) has a pH of 3.93. What is the molarity of the solution? (i.e. [HA]+[A-].)

Calculate Ka for a monoprotic acid

In a 4.03 * 10-2 M solution of a monoprotic acid, the percent dissociation is 49.6. Calculate Ka for this acid.

Carbon-14 content

The age of a piece of wood from an ancient source is determined by carbon dating. The carbon-14 content of a sample of the wood is found to be one-fourth that of living trees. The half life of carbon-14 is 5730 years. How old is the piece of wood?

Atomic masses

If a particular atom of Uranium 235 is struck by a neutron causing fission to occur, and two of the products are 3 neutrons and Krypton 93 What are the atomic number and mass number of the third product?

elements formed from supernova

Which element was probably NOT formed when a neutron star exploded as a supernova? a) Mn b) Cu c) Mo d) Ag e) Pb

Elements in atmosphere in pure form

Which group of elements is normally obtained from the atmosphere in pure form? a) sulfur, phosphorus, oxygen, nitrogen b) magnesium, sodium, calcium, strontium c) flourine, chlorine, neon, argon d) flourine, chlorine, oxygen, nitrogen e) oxygen, nitrogen, neon, argon

Ideal gas law problem; refer to the General Properties of Gases to review concepts and formulae related to ideal gases

A hydrogen gas thermometer is found to have a volume of 100.0 cm3 when placed in an ice-water bath at 0°C. When the same thermometer is immersed in boiling liquid chlorine, the volume of hydrogen at the same pressure is found to be 87.2 cm3. What is the temperature of the boiling point of chlorine?

Calorimetry and heat flow: calculation of basic thermodynamic quantities using simple "Coffee Cup" Calorimetry in the lab Refer to: bomb calorimetry and laws of thermochemistry

The following acid-base reaction is performed in a coffee cup calorimeter: H+(aq) + OH-(aq) --> H2O(l) The temperature of 110 g of water rises from 25.0°C to 26.2°C when 0.10 mol of H+ is reacted with 0.10 mol of OH-. Calculate qwater, Calculate ΔH for the reaction, Calculate ΔH if 1.00 mol OH- reacts ...continues