A compound contains 28% nitrogen and 72% of a metal by weight. Three atoms of metal combine with two atoms of nitrogen. If the atomic weight of nitrogen is 14, the atomic weight of the metal is:

Which of the following has the maximum number of electrons

Suppose the elements X and Y combine to form two compounds $X{Y_2}$ and ${X_3}{Y_2}$. When 0.1 mole of $X{Y_2}$ weights 10 g and 0.05 mole of ${X_3}{Y_2}$ weights 9 g, the atomic weights of X and Y are

A mixture of $CaCO_3$ and $MgCO_3$ weighing 1.84 g on heating leaves a residue weighing 0.96 g. If the percentage by mass of $CaCO_3$ in the original mixture is x%, what is the value of x/2?

Upon treating a mixture of $0.46$ g of formic acid and $0.9$ g of oxalic acid with concentrated $H_2SO_4$, a gaseous mixture is evolved. This mixture is then passed through pellets of $KOH$. Determine the mass (in g) of the remaining product at STP.

A 0.50 $M$ solution of $KI$ reacts with excess of ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$ and ${\rm{KI}}{{\rm{O}}_3}$ solutions according to the equation, $6{{\rm{H}}^ + } + 5{{\rm{I}}^ - } + {\rm{IO}}_3^ - o 3{{\rm{I}}_2} + 3{{\rm{H}}_2}{\rm{O}}$. Which of the following statements is true?

50 mL of a $\AgNO_3$ solution reacts completely with 50 mL of a 2.9% NaCl solution to form 3.587 g of AgCl precipitate. What is the percentage concentration of the $\AgNO_3$ solution?

If 100 mL of a 17.0% $\AgNO_3$ solution is reacted with excess NaCl, what mass of AgCl will precipitate?

Number of atoms in 558.5 g of Fe is (at . wt = 55.85)

What is the minimum volume (in mL) of a 17.0% $\AgNO_3$ solution required to completely precipitate all chloride ions from 100 mL of a 5.8% NaCl solution?

Two elements, R and S, combine to form $RS_2$ and $R_2S_3$. If 10 g of $RS_2$ contains 0.1 mole and 9 g of $R_2S_3$ contains 0.05 mole, find the atomic weights of R and S.