Cinnabar (HgS) is a prominent ore of mercury. How many grams of mercury are present in 225g of pure HgS? Molar mass of Hg and S are 200.6 g `mol^(-1)` and `32g mol^(-1)` respectively.

How many grams of MgCO_(3) contain 24.00 g of oxygen ? (The molar mass of MgCO_(3) " is " 84.30 " g mol"^(-1))

The density of liquid mercury is 13.6 g//cm^(3). How many moles of mercury are there in 1 litre of the metal? (Atomic mass of Hg=200).

The density of liquid mercury is 13.6 g//cm^(3). How many moles of mercury are there in 1 litre of the metal? (Atomic mass of Hg=200).

The density of liquid mercury is 13.6 g//cm^(3). How many moles of mercury are there in 1 litre of the metal? (Atomic mass of Hg=200).

Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at T(K) are 50mm Hg and 40 mm Hg respectively. What is the mole fraction of toluene in vapour phase when 117 g of benzene is mixed with 46g of toluene? (molar mass of benzene and toluene are 78 and 92 g mol^(-1) respectively).

Atomic mass of mercury is 200 and density is 13.6 g cc^(-1) . How many moles of metal are present in one litre ?

What is the molality of a solution containing 200 mg of urea (molar mass = 60 g mol^(-1) ) in 40g of water ?

Gold has a molar mass of 197 g/mol. (a) How many moles of gold are in a 1.50 g sample of pure gold? (b) How many atoms are in the sample?