Question

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Answer 1

Answer:

6/24=1/4 then multiply 1/4*23

Explanation:

mole=mass in gram/molar mass formula are used

Answer 2

Explanation:

First of all, we know that if two species have the same number of atoms, they must have the same number of moles, because the number of atoms present in 1 mole is equal to

6.022 x 1023

To calculate the number of moles of any substance present in the sample, we use the formula given below:

N =

m

M

Here, N is the number of moles present in the

sample

m is the given mass,

M is the molar mass of the element.

Now, here we need to find the number of

moles for magnesium (Mg):

By using the formula mentioned above:

Moles of Mg: N = given mass of Mg

molar mass of Mg

6 1

= - = 0.25 molesNow, we know that, number of moles of magnesium = number of moles of sodium.

given mass of Na

Thus, moles of Na: N = molar mass of Na

m

= 0.25

23

Thus, m = 0.25 x 23 5.75g

Hence, option A is the correct option..

Note: The mole is the unit to measure the quantity of substance present in any sample and number of atoms present in 1 mole is

equal to 6.022 x 1023 where 6.022 x 1023 is

NA called the Avogadro number.