What is the mass of 1 L of mercury in grams and in kilograms, (the density of liquid mercury in grams is `13.6gcm^3`)?

Calculate the mass of 5 moles of CaCO_3 in grams.

What will be mass of 89.6L of ammonia (NH_3) gas at STP?

What is the pressure inside the drop of mercury of radius 3.00mm at room temperature?Surface tension of mercury at that temperature (20°C) is 4.65×10^(-1) Nm^(-1) .The atmospheric pressure is 1.01×10^5 Pa .Also give the excess pressure inside the drop.