Question

12g of alkaline earth metal gives 14.8g of its nitride.Atomic weight of metal is

Answer 1

let the metal be M with atmic wt. be x


so 3M + N2 ---->M3N2


      3x                   3x+28


 so,  12/3x   = 14.8/(3x+28)


which in solving for x gives 40


the metal is calcium and its nitride is Ca3N2

Answer 2

Answer:

Concept:

The alkali metals are a collection of six chemical components that belong to group 2 of the periodic chart. The elements involved are francium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra) (Ra). The elements have fairly similar properties at standard temperature and pressure: they're all glossy, silvery-white, and somewhat reactive metals. They (together with helium) share a physically complete outer s-orbital, which has its complete set of two electrons, which the alkali metals soon lose to form cations with charge +2 and oxidation state +2. Radium is only found as a byproduct of the breakdown of radioactive elements, rather than as a basic element, in nature.

Given:

12 grammes of alkoxide produce 14.8 grammes of nitride. Metal's atomic weight is

Find:

find the answer for the given question

Answer:

The atomic weight of every atom can be computed by multiplying the abundance of an element's isotope by the element's atomic mass and then adding the results. Make a list of the known and unknown parameters and devise a strategy for solving the problem. Divide each percent abundance by 100 to get a decimal value. Multiply this value by the isotope's atomic mass. To calculate the average atomic mass, add the masses of each isotope together.

Let the metal be M with atomic wt. be x.

So,

$3M+N_{3} - > M_{3} N_{2}$

​$3x$                

$3x+28$

So,

$\frac{12}{3x} =\frac{14.8}{3x+28}$

Which in solving for $x$ gives $40$

The metal is calcium and its nitride is $Ca3N_{2}$

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