Calculate the mass in atomic mass units of 0.25 mol of carbon-12 atoms

The mole is 6.02 x 10^ (23) and it is a very large number. How many moles of atoms are in 1.35g of aluminum?

Which element has a mass percent composition of 54.50% in vitamin c, c6h8o6?

A liquid changes color as it cools and becomes solid. How can you confirm the type of change that took place?

If a 0.614 g sample of a gas maintains a pressure of 238 mm hg when contained in a 1.0 l flask at 0.0°c, what is the gas's molecular weight?

What is the most important role that water plays for living organisms A: All organisms need water to stay clean B: All organisms need water as an energy source C: All organisms need water to transport chemicals into their cells D: All organisms live

Classify the following reactions: HNO3 (aq) + NH3 (aq) →NH4NO3 (aq) + H2O (l) 2Cu (s) + O2 (g) →2CuO (s) NaCl (aq) + AgNO3 (aq) →NaNO3 (aq) + AgCl (s) 2LiOH (aq) + H2SO4 (aq) →Li2SO4 (aq) + 2H2O (l) CaCl2 (aq) + K2CO3 (aq) →2KCl (aq) + CaCO3 (s)

Justine's hair dryer has a resistance of 20 Ohms when first turned on. How much current does the hair dryer draw from the 110.-V line in Justine's house? (Answer in amps)

How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain? a. 50 protons, 50 electrons, 75 neutrons. b. 120 neutrons, 50 protons, 75 electrons. c. 75 electrons, 50 protons, 50 neutrons. d.

If 15.0g of nitrogen reacts with 15.0g of hydrogen, 10.5g of ammonia os produced. What is the percent yield of this reaction.

Based on this information which alternative energy source should the community consider investing in