Average atomic mass of magnesium is `24.31`amu. This magnesium is composed of 79 mole % of `24mg` and remaining 21 mole % of `25mg and 25mg`. Calculate mole % of `26mg`.

In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are "_12^24Mg (23.98504u), "_12^25Mg (24.98584u) and "_12^26Mg (25.98259u). The natural abundance of "_12^24Mg is 78.99% by mass. Calculate the abundances of other two isotopes.

What is the mass in grams of each of the following : 0.5 mole of Mg.(atomic mass: Mg =24).

Calculate the number of moles in the following 4.68 mg of silicon

Calculate the number of moles in the following : (2) 7.9 mg of Ca

A solution is 25% water, 25% ethanol and 50% acetic acid by mass. Calculate the mole farction of each component.

NH_(3) is heated at 15 at, from 25^(@)C to 347^(@)C assuming volume constant. The new pressure becomes 50 atm at equilibrium of the reaction 2NH_(3) hArr N_(2)+3H_(2) . Calculate % moles of NH_(3) actually decomposed.

Calculate the number of moles in the following masses : 83.5 mg of F

If average molecular mass of air is 29, then assuming N_(2) and O_(2) gases are there, which option are correct regarding composition of are? (i) 75% "by mass of" N_(2)" "(ii) 75% "by moles "N_(2)" "(iii)72.41% "by mass of" N_(2)

A solution prepared by dissolving 8.95 mg of a gene fragment in 35.0 mL of water has an osmotic pressure of 0.335 torr at 25^(@)C . Assuming that the gene fragment is a non-electrolyte, calculate its molar mass.