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:
Calculate the relative molecular mass of Ammonium sulphate.
(use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S= 32)
Fill in the blank.
Molecular weight of a gas is twice its __________.
An organic compound has the following percentage composition: C = 12.76%, H = 2.13%, Br = 85.11%. The vapour density of the compound is 94. Find out its molecular formula.
Calculate the percentage of phosphorous in the fertilizer superphosphate, Ca(H2PO4)2. [Ca = 40, H =1, P =31, O = 16] (Correct to 1 decimal place)
A metal M, forms a volatile chloride containing 65.5% Chlorine. If the density of the chloride relative to hydrogen is 162.5, find the molecular formula of the chloride. [M = 56, Cl = 35.5]
Calculate the relative molecular mass of:
(NH4)2SO4
Calculate the relative molecular mass of:
CH3COONa
What do you understand by the statement that ‘vapour density of carbon dioxide is 22’?
The following question refers to one mole of chlorine gas.
If the relative atomic mass of chlorine is 35.5, what will be the mass of 1 mole of chlorine gas?
