There are two that seem correct to me but i would go with the first answer choice, a mole of cu atoms has the same number or atoms as a mole of he atoms.
All alcohols are polar.
True
The _____melting point________ is the temperature at which a substance changes from solid to liquid; _______boiling point_________ is the temperature at which a substance changes from a liquid to as gas; _______vapourisation_________ is the process by which atoms of molecules leave a liquid and become a gas.
Answer:
1.015g
Explanation:
From the question,
Mass of Al used = 0.660g
The percentage yield = 63.5%
Mass of Alum used = y
To find the mass of Alum used, do the following:
%yield = Mass of Al /Mass and Alum
65% = 0.660/y
65/100 = 0.660/y
Cross multiply
65 x y = 0.660x100
Divide both side by 65
y = (0.660x100) / 65
y = 1.015g
The mass of alum obtained is 1.015g
