Search & Filtering
in a compound of magnesium and nitrogen 54g of magnesium combined with21g of nitrogen.determine the emphirical formulae of te compound
A student transferred 50.0 mL 1.00 M HCl into a coffee-cup calorimeter, which had a temperature of 25.5 oC. He then added 50.0 mL 1.00 M NaOH, which also had a temperature of 25.5 oC, and stirred the mixture quickly. The resulting solution was found to have a temperature of 32.5 oC. The calorimeter constant for the coffee-cup calorimeter used was 15.0 J/ oC. Calculate the heat of reaction.
A solution containing 3.75 mg/100 ml of X (335 g/mol) has a transmittance of 39.6% in a 1.50-cm cell at 425 nm. Calculate the molar absorptivity of X .
A solution prepared from 0.3 g of an unknown nonvolatile solute and 30 g CCI, has a boiling point of 0.392 °C higher than that pure CCl. What is the molecular weight of the solute?
The ocean pressure at the depth of the Titanic wreck is 400. atm. Calculate the ocean pressure in kPa. Be sure your answer has the right number of significant digits.
What kind of intermolecular forces act between a chloroform CHCl3 molecule and a chloroacetylene C2HCl molecule? Note: If there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force.
Ammonium salts are used by farmers as nitrogenous fertilizers. Calculate:the mass of nitrogen that can be provided by 5.0 kg of the salt.
State the trend of atomic size across the period and down the group in the periodic table. Explain your answer.
Write down the set of four quantum numbers for the valence electron in potassium (K) atom.
State the strongest intermolecular force that exists between molecules of the following substances:
i) I2
ii) H2O
iii) CH3Br
iv) HCl
