Question

calculate the no.of molecules / atoms in
a)0.5 moles of NH3
b)2 moles of co2 {HINT N= n XNo}

Answer 1

Answer:

1 mole of nitrogen contains =6.022×10

23

atom

∴ 0.5 mole of nitrogen contains =(0.5×6.022×10

23

)

=3.011×10

23 atoms

Avogadro said that 1 mole of any compound will contain 6.023 × 10²³ particles. That implies, 5 moles of NH3 will contain 5 × 6.023 × 10²³ NH3 molecules. So, 5 moles of NH3 will contain 3 × 5 × 6.023 × 10²³ H atoms

(a) ∵ 1 mole of CO

2

has molecular mass =44

∴ 2 moles of CO

2

has molecular mass =2×44=88g

Avogadro's number shows us that there are 6.022 x 10^23 molecules of CO2 in 1 mole of the gas. Therefore, there are 6.022 x 10^23 atoms of carbon and 12.044 x 10^23 atoms of oxygen in that 1 mole of CO2.

Answer 2

Explanation:

Cranes combine simple machines to lift extremely heavy objects. In balance-style cranes, the crane's beam is balanced at a point, called the fulcrum. This allows it to lift heavy objects with a relatively small force. In this way, the crane's beam acts as a simple lever.