3.2 Mole concept

Calculate the number of moles of

 $4.5\times10^{23}$  nitrogen molecules,  $N_2$  .
 $\left[N_A:\ 6\times10^{23\ \ }mol^{-1}\right]$  

• 0.75

• 0.65

• 0.55

• 0.45

Calculate the number of particles in

3.5 mol of lead, Pb.
 $\left[N_A:\ 6\times10^{23\ \ }mol^{-1}\right]$  

•  $3.5\times10^{23\ }atoms$  

•  $2.1\times10^{24}\ atoms$  

•  $3.5\times10^{23\ }ions$  
  

•  $2.1\times10^{24}\ ions$  
  

Calculate the number of particles in

0.5 mol of lead(II) ions,  $Pb^{2+}$  .
 $\left[N_A:\ 6\times10^{23\ \ }mol^{-1}\right]$  

•  $0.5\times10^{23\ }atoms$  

•  $3\times10^{23}\ atoms$  

•  $0.5\times10^{23\ }ions$  
  

•  $3\times10^{23}\ ions$  
  

Calculate the number of atoms in

2 mol of ammonia,  $NH_3$  .
 $\left[N_A:\ 6\times10^{23\ \ }mol^{-1}\right]$  

•  $48\times10^{23\ }atoms$  

•  $12\times10^{23}\ atoms$  

•  $4.8\times10^{24\ }atoms$  
  

•  $1.2\times10^{24}\ atoms$  
  

Calculate the number of atoms in

1 mol of aluminium, Al
 $\left[N_A:\ 6\times10^{23\ \ }mol^{-1}\right]$  

•  $6\times10^{23\ }atoms$  

•  $12\times10^{23}\ atoms$  

•  $6\times10^{24\ }atoms$  
  

•  $1.2\times10^{24}\ atoms$  
  

Calculate the number of atoms in

32 g oxygen atom, O.
[RAM: O = 16]

• 512 mol

• 32 mol

• 16 mol

• 2 mol

Tags

NGSS.HS-PS1-7

Calculate the number of atoms in

16 g oxygen gas,  $O_2$  .
[RAM: O = 16]

• 0.5 mol

• 2 mol

• 16 mol

• 32 mol

Calculate the mass in

0.3 mol chlorine atom, Cl.
[RAM: Cl = 35.5]

• 118.33 g

• 35.80 g

• 35.50 g

• 10.65 g

Tags

NGSS.HS-PS1-7

Calculate the mass in

3.2 mol ammonia gas,  $NH_3$  .
[RAM: N = 14, H = 1]

• 17.2 g

• 23.4 g

• 48.0 g

• 54.4 g

Tags

NGSS.HS-PS1-7

Calculate the number of moles of  $448cm^3$  of nitrogen gas,  $N_2$   at STP.

 $\left[Molar\ volume:\ 22.4dm^3mol^{-1}at\ STP\right]$  

• 0.01 mol

• 0.02 mol

• 0.03 mol

• 0.04 mol