Question

which of the following weighs most 50g of iron, 5g atoms of nitrogen, 0.1g atoms of silver., 1×10²³

Answer 1

In my opinion weight of 5g atoms of nitrogenis most .

Answer 2

Answer : 5 g atoms of nitrogen weighs most.

Explanation :

We have to calculate the mass for all the options.

For part 1 : 50 g of iron

The mass of iron = 50 g

For part 2 : 5 g atoms of nitrogen

As we know that the 5 gram atom is equal to 5 moles

As, 1 mole of nitrogen contains 28 g of nitrogen

So, 5 moles of nitrogen contains $28\times 5=140g$ of nitrogen

The mass of nitrogen = 140 g

For part 3 : 0.1 g atoms of silver

As we know that the 0.1 gram atom is equal to 0.1 moles

As, 1 mole of silver contains 108 g of silver

So, 0.1 moles of silver contains $108\times 0.1=10.8g$ of silver

The mass of silver = 10.8 g

For part 4 : $1\times 10^{23}$ atoms of carbon

As, $6.022\times 10^{23}$ atoms of carbon present in 12 g of carbon

So, $1\times 10^{23}$ atoms of carbon present in $\frac{1\times 10^{23}}{6.022\times 10^{23}}\times 12g=1.99g$ of carbon

The mass of carbon = 1.99 g

From this we conclude that 5 g atoms of nitrogen weighs most.

Hence, the correct option is, 5 g atoms of nitrogen