How can I calculate the required grams of two chemicals from their molar ratios?

Thanga Bharathi Tamilmani @Thanga-Tamilmani

31 August 2022 1 992 Report

Metal Gallium is dissolved in 70% of conc.HNO3 in the molar ratio of 1:16. Therefore, How many grams of Gallium and how many litres of HNO3 to be taken for the above said molar ratios?

David Elks

Molar mass of HNO3 is 63.

RMM of Ga is 69.7

70% Nitric has approx 15.7 moles per litre (if we allow rounding of this up to 16, then we need approxinately 1 mole of Gallium or 69.7 grams in that one litre solution.

For greater accuracy, if we ratio the 15.7 by dividing by 16, and then multiply this by 69.7 we get more accurately, a mass of 68.39 grams gallium.

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