A sample of carbon-12 has a mass of 6.00g. how many atoms of carbon-12 are in the sample?

What is the number of magnesium atoms that equal a mass of 24.31 amu?

A 20 gram piece of metal is added to a sample of 100 grams of water inside a calorimeter. If the metal is at a temperature of - 5° Celsius and the water is at 20° Celsius, which of the following best describes what will occur inside the calorimeter?

Hydrogen is a reactive gas under normal conditions. Based on this property alone, to which group of the periodic table should hydrogen belong? why?

Suppose we have a solution of lead nitrate, Pb (NO3) 2 (aq). A solution of NaCl (aq) is added slowly until no further precipitation of PbCl2 (s) occurs. The PbCl2 (s) precipitate is collected by filtration, dried, and weighed. A total of 12.

A 55g piece of copper wire is heated and the temperature of the wire changes 19 to 86 the amount of heat absorbed is 343 cal what is the specific heat of copper

A solution of orange juice that weighs 500 g contains liquid juice and solid pulp. All of the pulp is removed from the juice. The pulp is found to weigh 50 g. How much would the remaining liquid juice weigh? A. 50 g B. 250 g C. 450 g D. 500 g

Assume 3 molecules of Fe react according to the following equation. 3Fe + 4H2O Fe3O4 + 4H2 How many molecules of H2 are produced? How many water molecules are required? What is the mole ratio of Fe to H2O?

10.0 mL of a HF solution was titrated with a 0.120 N solution of KOH; 29.6 mL of KOH were required to completely neutralize the HF. Calculate the normality of the HF solution.

The number of grams present in 1.35 mol of Fe is

Which can associate a suspect's gun with a crime?