Avogadro's Number — Prelims Questions

What is the number of oxygen atoms in 0.5 moles of $H_2SO_4$?

What is the mass of $3.011 \times 10^{23}$ molecules of nitrogen gas ($N_2$)? (Atomic mass of N = 14 amu)

Which of the following statements about Avogadro's Number is INCORRECT?

How many electrons are present in 1.6 grams of methane ($CH_4$)? (Atomic mass: C=12, H=1. Avogadro's Number = $6 \times 10^{23}$)

What volume will $1.5 \times 10^{23}$ molecules of $SO_2$ gas occupy at STP? (Avogadro's Number = $6 \times 10^{23}$)

If 1 gram of hydrogen gas ($H_2$) contains 'x' molecules, then 1 gram of oxygen gas ($O_2$) will contain: