Amongst $6.4 \mathrm{g}$ of sulphur and $9.3 \mathrm{g}$ phosphorus, the element which has more moles is:

[Atomic mass of $\mathrm{S}=32, \mathrm{P}=31$]

$1$ g of silicon contains $\mathrm{P}$ atoms. The number of atoms in $1$ g of calcium is:

$\left[\mathrm{Si}=29; \mathrm{Ca}=40\right]$

$4$ g magnesium contains $\mathrm{P}$ atoms. The number of atoms in $5.4$ g of aluminium is:

$\left[\mathrm{Al}=27; \mathrm{Mg}=24\right]$

$22$ g carbon dioxide has:            

$\left[\mathrm{C}=12; \mathrm{O}=16\right]$

$0.6$ mol of hydrogen peroxide [${\mathrm{H}}_2{\mathrm{O}}_2$] weighs:        

$\left[\mathrm{H}=1,\mathrm{O}=16\right]$

$0.15$ g mol of ammonia weighs?        

$\left[\mathrm{N}=14; \mathrm{H}=1\right]$