The measured density at `NTP` of `He` is `0.1784 g L^(-1)`. Calculate the weight of `1 "mole"` of `He`.

Calculate the weight of 0.1 mole of sodium carbonate.

The measured density at STP of He is 0.1762 g/L. What is the weightof one mole of He?

Calculate the number of moles in : 52g of He.

The measured density of helium gas at NTP is 0.1784 gm per litre. What is the weight of 1 mole of this gas ?

Calculate the number of moles in : 52g of He

Calculate weight of 0.1 moles of Na_(2)CO_(3) ?