Quiz | The periodic table and Chemical Periodicity
How many atoms of hydrogen do you have in 2.0 moles of H2?
6.0 x 1023 atoms
1.2 x 1024 atoms
2.4 x 1024 atoms
We need the mass to answer this question
n = ⇒ number of dihydrogen atoms = x NA = 2.0 x 6.022 x 1023 atoms
⇒ number of hydrogen atoms = 2 x
What is the SI unit of molar mass?
The SI unit of molar mass M is g.mol-1
What is the mole number of 12.4 g of MgCl2 (MMg = 24.3 g.mol-1, MCl = 35.5 g.mol-1)?
1.30 x 10-2 mol
1.18 x 103 mol
mole number =
with MMgCl2 = MMg + 2 x MCl = 95.3 g.mol-1
What is the empirical formula of CH3CH2CH2O-O-CH2CH2CH3?
Empirical formula = the simplest whole-number ratio of atoms in a compound
Which of the following statements is incorrect?
Halogens are colorful and corrosive nonmetals and are diatomic molecules in nature
Noble gases are the last group of the periodic table and are inert gases
Alkali metals form the first group of the periodic table while alkaline-earth metals form the second
None of the above
What is the second period in the periodic table?
Li, Be, B, C, N, O, F, Ne
Be, Mg, Ca, Sr, Ba, Ra
Na, Mg, Al, Si, P, S, Cl, Ar
F, Cl, Br, I, At