What is the theoretical yield of the reaction of aluminum oxide when 15.0 g of aluminum reacts with excess oxygen? 4Al(s) + 3O2(g) → 2Al2O3(s) these are the options
Question 3 options:

7.50 g Al2O3

15.0 g Al2O3

28.3 g Al2O3

56.7 g Al2O3

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

they are all solids.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.