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Depression in Freezing Point

#8203;if 1 mo...

Question

if 1 mole of pottassium chromate and 1 mole of lead nitrate gives 1 mole of lead chromate and 2 moles of pottassium nitrate, how many grams of lead chromate will beobtained formed using 7g of potassium chromate and 10g of lead nitrate.

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Solution

$K_{2} C r O_{4} + P b (N O_{3})_{2} \to P b C r O_{4} + 2 K N O_{3} 194 g 331 g 323 g 2 (101) = 202 g 194 g o f p o t a s s i u m c h r o m a t e r e a c t s w i t h 331 g l e a d n i t r a t e S o 7 g o f p o t a s s i u m c h r o m a t e r e a c t s w i t h = \frac{331}{194} \times 7 = 11.94 g o f l e a d n i t r a t e S i n c e t h e a m o u n t o f l e a d n i t r a t e g i v e n i s 10 g, i t a c t s a s a l i m i t i n g r e a g e n t . 331 g o f l e a d n i t r a t e g i v e s 323 g o f l e a d c h r o m a t e 10 g o f l e a d n i t r a t e g i v e s = \frac{323}{331} \times 10 = 9.76 g o f l e a d c h r o m a t e i s f o r m e d$

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