What is the total number of nitrogen atoms in 0.25 mole of no2 gas?

1.5*10^23 atoms

Explanation:

What is the total number of nitrogen atoms in 0.25 mole of no2 gas?

mole is the amount of a substance. Its is calculated as mass of a substance over molecular mass(g/mol).

it contains 1 avogadro constant

1 mol=6.02*10^23 avogadros constant

0.25mol=x

so cross and multiply to get the value of x

6.022140857( 74 ) × 10 ^23

0.25*6.022*10^23

nitrogen atoms in such a molar quantity of nitric oxide,

1.5*10^23 atoms

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.