04 - Calculate the no. of atoms/ molecules in each of the following -
(a) 46g of Na atoms (b) 8g of 02 molecule
Answers
a) 46g of Na atom
atomic mass of Na=23u
Number of particles=Number of Moles x N
⇒(given weight/ Gram atomic weight) x 6.023 x 10²³
=(46/23)x 6.023 x 10²³
=2x 6.023 x 10²³
⇒12.046 x 10 ²³Na particles
∴46 g of Na contains 12.044 x 10 ²³
b)8g of O2 moles
molecular mass of O2=32u
No. Of molecules in O2 molecules=(8/32) x 6.022 x 10²³⇒0.25 x 6.023 x 10 ²³
⇒1.5055x 10 ²³ molecules
∴8g of O2 contains 1.5055x 10²³ molecules.
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Once the crop has reached maturity, it now needs to be harvested. So harvesting is the cutting and gathering of the matured crop. The term harvesting also generally includes the immediate post-harvest practices such as threshing and winnowing. Let us look at both these processes
Threshing: The process of separating the grains from their chaffs or pods is threshing
Winnowing: After threshing, we must separate the grains from the chaffs. Winnowing is the process of separating the grains.
There are various factors to consider before the harvesting of crops. The crops need close examination to ensure that harvesting is not premature. This leads to shedding of seeds and loss of crop. And if the crops are overripened, they lose their value in the market or may even be unconsumable.
Harvesting in India is generally done manually. Sicles is a tool that is used to cut the crop. This method is a laborious and time-consuming and only suitable for small-sized farms. On larger farms, a harvester is used which combines harvesting with threshing and winnowing.