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Define the atomic mass unit.

Asked by Santosh 07/12/2017 Last Modified 20/03/2018

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Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?

100 gm of sodium will have (Given mass / molar mass )x Avogadro's Number = (100/23) x 6.022 x 10^23 = 2.62 x 10^24 atoms 100 gms of Iron will have (100/56) x 6.022 x 10^23 = 1.07 x 10^24 atoms So 100 gms of Sodium will have more atoms.

Nasar

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Why are we able to sip hot tea or milk faster from a saucer rather than a cup?

Surface area of a saucer is greater than the cup. More the surface area more there will be exchange the heat with the surrounding to reduce temperature of tea as well as more quantity of tea will enter in the mouth in one sip in case of saucer.

Sarath Chandra

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Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have?

Mass number of Helium = 4 Number of protons = 2 Number of neutrons(n) = Number of Mass(A) — Number of proton (P) = 4 – 2 = 2 Thus, No. of neutrons = 2

Venkat

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what is the formula for kinetic energty of object

kinetic energy=(mv²)/2 Where m is mass of the moving object , and v its velocity.

Murali

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What produces more severe burns, boiling water or steam?

Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.

Mukul

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