Copper is composed of two naturally occurring isotopes: Cu-63 (69.170%) and Cu-65. The ratio of the masses of the two isotopes is 1.0318. What is the mass of Cu-63?

Which statement is true regarding methane and ammonia? 1. methane molecules show hydrogen bonding 2. ammonia molecules show hydrogen bonding 3. methane has stronger hydrogen bonding than ammonia 4. both the compounds do not show hydrogen bonding 5.

Which two conditions must exist in population for natural selection to take place?

Suppose an alkane had 30 hydrogen atoms. How many carbon atoms would it have? a. 15 atoms c. 14 atoms b. 62 atoms d. 28 atoms

What is the molar mass of calcium?

The rate law for the reaction 2H2 (g) + 2NO (g) ⟶ N2 (g) + 2H2O (g) is rate=k[H2][NO]2. What is the overall order of the reaction? 3 2 4 7

What pressure is exerted by 0.750 mol of a gas at 0 °C and a volume of 5 L? 2.1 atm 3.4 atm 4.98 atm 760 atm

8) What is the molarity (M) of an aqueous solution containing 22.5 g of sucrose (C12H22011) in 35.5 mL of solution? A) 3.52 M B) 1.85 x 10-2M C) 0.104 M D) 0.0657 M E) 1.85 M

D5W is a solution used as an intervenous fluid. It is 5.0% by mass solution of the dextrose (C6H12O6) in water. if the density of D5W is 1.029 g/ml. Calculate the molarity of the dextrose in the solution.

In the titration of sodium oxalate with potassium permanganate, pure sodium oxalate (Na2C2O4, MM = 133.9985 g/mol) is used to find an accurate Molarity of a potassium permanganate (KMnO4) solution. If 98.

Who is the first scientist that discovered DNA?