Chemistry Answers

What is the mass of technical calcium carbide with a mass fraction of 12% required for the production of acetylene with a volume of 6.72 l (nu)?

1)     What is the mass of water if it contains 5 moles of hydrogen atoms?                              

2)      Aspirin is a compound with the molecular formula C₉H₈O₄. What is its percent composition?

3)     A 24.81-g sample of a gaseous compound containing only carbon, oxygen, and chlorine is determined to contain 3.01 g C, 4.00 g O, and 17.81 g Cl. What is this compound’s percent composition?

What is the mass of water if it contains 6.022 x 10²⁵ atoms of oxygen

How many grams of Lactic acid (C6H10O5) should be dissolved in 647g of cyclohexane (C6H12) to raise the boiling point to 84.910C? The normal boiling point of cyclohexane is 810C and its molal boiling point is 2.75 0C/m.

using conversion method, calculate the molality and molarity of aqueous phosphoric acid solution 1.88 gram/ml containing 20% by mass of h3 po4? h=1 p=31,o=16

A solution prepared by adding 10g of an unknown non-volatile, non-electrolyte solute to 100 g of water. The Boiling point of the solution is elevated by 0.433 0C above the normal boiling point of the solvent. What is the molar mass of the unknown substance?

A solution prepared by adding 10g of an unknown non-volatile, non-electrolyte solute to 100 g of water. The Boiling point of the solution is elevated by 0.433 0C above the normal boiling point of the solvent. What is the molar mass of the unknown substance?

calculate the molality and molarity of aqueous phosphoric acid solution 1.88 gram/ml containing 20% by mass of h3 po4? h=1 p=31,o=16

Acetylene, C2H2, is a gas used in welding. The heat evolved for the combustion of acetylene is –33.79 kJ. If the heat capacity of the calorimeter is 5.54 kJ/0C, what is the temperature increase of the bomb calorimeter?

If the same amount of energy in the form of heat is added to 5.00 g samples of metals Ag, Al, Cu, which metal will undergo the largest temperature change? The heat capacities of the metals in J/g 0 C are: 0.235, 0.897, 0.385 respectively.