Erbium (Er) is element 68 on the periodic table. A sample contains 5.04*1023 atoms of Er. Calculate the amount of Er.

What is the molar mass of silver (Ag) ? A) 47.0 g/mol B) 60.02 g/mol C) 107.87 g/mol D) 196.97 g/mol

Which choice best describes the specific heat of water compared with that of metals? A) The specific heat of water is less than the specific heat of metals. B) The specific heat of water is about the same as the specific heat of metals.

The type of radiation which is identical to a high energy electron is known as a (n)

An element consists of 1.40% of an isotope with mass 203.973 u, 24.10% of an isotope with mass 205.9745 u, 22.10% of an isotope with mass 206.9759 u, and 52.40% of an isotope with mass 207.9766 u.

What is the relationship between chemical equilibrium and the rates of forward and reverse reaction

How much MnO2 (s) should be added to excess HCl (aq) to obtain 295 mL of Cl2 (g) at 25 °C and 735 Torr?

Why do people describe water as a universal solvent

What is litmus paper used for? To indicate if all the reactants have been used up to determine if a chemical reaction has occurred to determine pH to detect the presence of water

You open your lemonade stand with 100 lemons, 5 bags of sugar containing 6 cups each, and 10 gallons of water (16 cups per gallon). Which statement is NOT true about the production of lemonade in your stand?

For the complete combustion of 5.6dm3 of a gaseuos hydrocarbon CxHy. 28.0dm3 of oxygen gas were used, 16.8dm3 of CO2 gas and 18.0gof liquid water were produced all gases measurement were made at stp. Determine the chemical formula of the hydrocarbon