How many moles of electron weighs one kilogram?

Which has maximum number of atoms? (At. wts are given within brackets)

Dissolving 120g of urea (mol. wt. 60) in 1000g of water gave a solution of density 1.15 g/mL. The molarity of the solution is :

The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl and 250 mL of 2.0 M HCl will be :

The highest mass corresponds to which of the following :

The chloride of a metal has the formula $MC{l}_{3}MCl\_3$. The formula of its phosphate will be :

By heating 10g $CaC{O}_{3}CaCO\_3$, 5.6g CaO is formed, what is the weight of $C{O}_{2}CO\_2$ obtained in this reaction?

If 32g of $O_{2}O\_2$ contains $6.022\times {10}^{23}6.022\; \backslash times\; 10^\{23\}$ molecules at NTP, then 32 g of S, under the same conditions, will contain :

The total number of protons in 10g of calcium carbonate is

How many millilitres (mL) of 1M $H_{2}S{O}_{4}H\_2SO\_4$  solution is required to neutralize 10 mL of 1M NaOH solution?