Find the percentage of
(a) oxygen in magnesium nitrate crystals $[M g (N O_{3})_{2} 6 H_{2} O]$ .
(b) boron in $N a_{2} B_{4} O_{7} . 10 H_{2} O . [H = 1, B = 11, O = 16, N a = 23] .$
(c) phosphorus in the fertilizer superphosphate $C a (H_{2} P O_{4})_{2}$

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Solution

(a) The molecular mass of (Mg(NO₃)₂.6H₂O = 256.4 g
% of Oxygen = 12 x 16/256
= 75%

(b) The molecular mass of boron in Na₂B₄O₇.10H₂O = 382 g
% of B = 4 x 11/382 = 11.5%

(c)
Molecular mass of $C a (H_{2} P O_{4})_{2}$
is 234g
Atomic mass of phosphorus is 30g

Percentage of phosphorus = (2×30 / 234) × 100 = 25.64%

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Similar questions

Q. Find the total percentage of Magnesium in magnesium nitrate crystals:

[M g (N O_{3})_{2} 6 H_{2} O .

(M g = 24, O = 16

and

H = 1)

Calculate the percentage of phosphorus in the fertilizer, superphosphate $C a (H_{2} P O_{4})_{2}$ . [H = 1, O = 16, P = 31, C = 40]

Calculate the percentage of Boron ( $B$ ) in $N a_{2} B_{4} O_{7} .10 H_{2} O$ . Answer correct to 1 decimal place. [H = 1, B = 11, O = 16, Na = 23].

Calculate the percentage of phosphorus in the fertilizer superphosphate, Ca(H₂PO₄)₂ (correct to 1 decimal place.) [Ca = 40, H = 1, P = 31, O = 16]

Calculate the percentage of phosphorus in the fertilizer, superphosphate $C a (H_{2} P O_{4})_{2}$ .(Correct to 1 decimal point). [H = 1, O = 16, P = 31, C = 40]

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Find the percentage of (a) oxygen in magnesium nitrate crystals [Mg(NO3)26H2O]. (b) boron in Na2B4O7.10H2O.[H=1,B=11,O=16,Na=23]. (c) phosphorus in the fertilizer superphosphate Ca(H2PO4)2

(a) The molecular mass of (Mg(NO3)2.6H2O = 256.4 g % of Oxygen = 12 x 16/256 = 75% (b) The molecular mass of boron in Na2B4O7.10H2O = 382 g % of B = 4 x 11/382 = 11.5% (c) Molecular mass of Ca(H2PO4)2 is 234g Atomic mass of phosphorus is 30g Percentage of phosphorus = (2×30 / 234) × 100 = 25.64%

Find the percentage of
(a) oxygen in magnesium nitrate crystals $[M g (N O_{3})_{2} 6 H_{2} O]$ .
(b) boron in $N a_{2} B_{4} O_{7} . 10 H_{2} O . [H = 1, B = 11, O = 16, N a = 23] .$
(c) phosphorus in the fertilizer superphosphate $C a (H_{2} P O_{4})_{2}$