A nickel coin is actually made of 75% copper and 25% nickel. A nickel coin weighs 5.0 grams. a) The atomic mass of copper is 63.546 amu. How many moles and how many atoms of
copper are in one nickel coin?
Step 1: Find 75% of 5.0 grams.
(0.75)(5.0) =
g of Cu
Step 2: Use the amount to calculate the number of moles.
g of Cu
1 mol C
mol Cu
63.546 g of Cu

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.