Question 13
How many particles are present in 400 grams of NaCl?
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There are 4.12 × 10²⁴ particles  present in the 400 grams of sodium chloride.    

Explanation:

We need to find the number of particles present in given mass of sodium chloride.

For that we have to convert the given mass into moles by dividing it with its molar mass, so that it can get converted.

Moles =

        =

       = 6.84 moles

Now this moles is converted into particles by multiplying it with the Avogadro's number of particles as,

Particles present = 6.84 × 6.022 × 10²³

                           = 4.12 × 10²⁴ particles

So there are  4.12 × 10²⁴ particles  present in the given mass of sodium chloride.    

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.