Calculate-A- Mass of 1-5-gram atoms of calcium- -Atomic mass - 40- -160-B- Gram atoms in 12-8 g of oxygen- -Atomic mass - 16-

(A)as gram atoms lt;= gt; no. of moleHence we have to calculate the mass of 1.5 NA of calcium #160; #160; #160; n = given massatomic mass mass ...

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Byju's Answer

Standard IX

Chemistry

Isotopes

Calculate.(A)...

Question

Calculate.
(A) Mass of 1.5-gram atoms of calcium. (Atomic mass = 40)
(B) Gram atoms in 12.8 g of oxygen. (Atomic mass = 16)

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Solution

(A)
as gram atoms <=> no. of mole
Hence we have to calculate the mass of 1.5 NA of calcium

n = $\frac{g i v e n m a s s}{a t o m i c m a s s}$

mass = $n \times a t o m i c m a s s$
= 1.5 * 40
= 60 g

(B)
n = $\frac{g i v e n m a s s}{a t o m i c m a s s}$

= $\frac{12.8}{16}$ mole
= 0.8 mole

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Similar questions

Q. The mass of 2 grams of atoms of calcium is :

(relative atomic mass=40)

Q. Calculate the gram molecular mass of water from the values of gram atomic mass of Hydrogen and of Oxygen.
Gram atomic mass of Hydrogen

= 1 g

Gram atomic mass of Oxygen

= 16 g

One mole of oxygen atom weighs 16 grams, what will be the mass (in grams) of 0.4 moles of oxygen atoms?

Gram Atomic mass is just the atomic mass expressed in grams ...ie, atomic mass with gram as units. Our book says that gram atomic mass and gram atom are the same thing (similarly for gram molecule and gram molecular mass) . But later a formula is given that : Gram atom = mass in grams / Atomic mass [RAM].

There are questions also that use this formula ( similarly for gram molecule) in which we have to find the number of "gram atoms " in a given mass of substance.

So what is the real meaning of gram atom and the formula ( and is is similar for gram molecules) ?

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Calculate.(A) Mass of 1.5-gram atoms of calcium. (Atomic mass = 40) (B) Gram atoms in 12.8 g of oxygen. (Atomic mass = 16)

(A)as gram atoms <=> no. of moleHence we have to calculate the mass of 1.5 NA of calcium n = givenmassatomicmassmass = n×atomicmass = 1.5 * 40 = 60 g(B)n = givenmassatomicmass = 12.816 mole = 0.8 mole

Calculate.
(A) Mass of 1.5-gram atoms of calcium. (Atomic mass = 40)
(B) Gram atoms in 12.8 g of oxygen. (Atomic mass = 16)

(A)
as gram atoms <=> no. of mole
Hence we have to calculate the mass of 1.5 NA of calcium

n = $\frac{g i v e n m a s s}{a t o m i c m a s s}$

mass = $n \times a t o m i c m a s s$
= 1.5 * 40
= 60 g

(B)
n = $\frac{g i v e n m a s s}{a t o m i c m a s s}$

= $\frac{12.8}{16}$ mole
= 0.8 mole