In which of the following are the amounts always equal in DNA? a. adenine and guanine b. cytosine and guanine c. thymine and cytosine d. cytosine and adenine

Calculate the molar mass of aspirin, C9H8O4

Which of the following samples has the greatest mass? A) 1.4 mol Na B) 1.02 _ 1024 atoms Na C) 23 g Na D) 6.02 _ 1023 atoms Na

Nitrogen has an atomic mass of about 14 amu and an atomic number of 7. how many neutrons does nitrogen have?

How many magnesiums are in 2mg2 O3

8.0g of NaOH was dissolved in 200ml of water to prepare a solution was used to titrate a 30 ml sample of H SO a. (Spts) Write the chemical equation s) for the dissociation of H SO, in water b.

A 2.00 L container of gas has a pressure of 1.00 atm at 300 K. The temperature of the gas is halved to 150K, and the measured pressure of the same 2.00 Liter sample is 0.420 atm.

How many moles of ZnCl, will be produced from 23.0 g of Zn, assuming CuCl, is available in excess?

Glaciation in Alaska is a result of interactions between which of the following "spheres"? Check all that apply. A. biosphere B. exosphere C. geosphere D. cryosphere E. atmosphere F. hydrosphere

In the following equation: FeCl3 + O2 = Fe2O3 + Cl2, what is the limiting reactant if 4 moles of FeCl3 react with 4 moles of O2?

What are some special effects you can make with dry ice?