Some Basic Conc...

The mass of a molecule of the compound $$C_{60}H_{122}$$ is __________.

According to the $$CaCO_3+HCl\rightarrow CaCl_2 +CO_2 + H_2O$$. What mass of $$CaCO_3$$ is required to react completely with $$25$$ml. of $$0.75M$$ $$HCl$$?

Two flasks $$A$$ and $$B$$ of $$500$$ mL each are respectively filled with $$O_2$$ and $$SO_2$$ at $$300$$K and $$1$$ atm pressure. The flasks contain:

15 g of methyl alcohol is present in 100 mL of solution. If the density of solution is 0.96 g $${ mL }^{ -1 }$$, Calculate the mass percentage of methyl alcohol in solution.

$$AgNO_3 $$ sample is 85% by mass. To prepare $$12.5\ m $$ of 0.05 molar $$AgNO_3$$ solution, $$AgNO_3$$ sample  required is:

A gas cylinder was found unattended in a public place. The investigating team took the collected samples from it. The density of the gas was found to be $$2.380\ g L^{-1}$$ at $$15^oC$$ and pressure. Hence the molar mass of the gas is:

What is the mass of the precipitate formed when $$50$$mL of $$16.9$$% solution of $$AgNO_3$$ is mixed with 
$$50$$ mL of $$5.8$$% $$NaCl$$ solution ?
(Ag = $$107.8$$, N =$$14$$, O = $$16$$, Na = $$23$$, $$Cl = 35.5$$)

3.49g of ammonia at STP occupies a volume of 4.48 $${ dm }^{ 3 }$$ calculate the molar mass of ammonia. 

The number of atoms of the $$He$$ in $$104\ amu$$ is:

Pehal and Ishaan were making $$100g$$ sugar solution with concentration by mass $$20\%$$ and $$50\%$$ respectively. Pehal added $$20 g$$ of sugar in her solution whereas ishaan evaporated $$20 g$$ of water from his solution. Now, the solutions were mixed to form a final solution, The concentration by mass of final solution is: