Advertisements
Advertisements
Question
Calculate the percentage of boron (B) in borax (Na2B4O7.10H2O). [H = 1, B = 11, O = 16, Na = 23],
answer correct to 1 decimal place.
Advertisements
Solution
Molecular mass of borax Na2B4O7.10H2O = 382
382 parts by weight of borax contain 44 parts by weight of boron
So,100 parts will contain = 44 x 100/382 = 11.5‰
Percentage of boron (B) in borax (Na2B4O7.10H2O) = 11.5‰.
APPEARS IN
RELATED QUESTIONS
Give balanced chemical equations for the following conversions A, B, and C:
Washing soda has the formula Na2CO3.10H2O.What is the mass of anhydrous sodium carbonate left when all the water of crystallization is expelled by heating 57.2 g of washing soda?
Mention the term defined by the following sentence:
The mass of a given volume of gas compared to the mass of an equal volume of hydrogen.
What is the vapour density of ethylene? (Avogadro's number = 6 x 1023; Atomic weight of C = 12, H = 1; Molar volume = 22.4 litres at STP)
Calculate the relative molecular mass of:
CuSO4. 5H2O
Calculate the relative molecular mass of:
(NH4)2SO4
Calculate the relative molecular mass of:
CH3COONa
Calculate the relative molecular mass of:
CHCl3
Which of the following contains maximum number of molecules?
67.2 litres of hydrogen combines with 44.8 litres of nitrogen to form ammonia under specific conditions as:
\[\ce{N2_{(g)} + 3H2_{(g)} -> 2NH3_{(g)}}\]
Calculate the volume of ammonia produced. What is the other substance, if any, that remains in the resultant mixture?
