a) (4p +3q)2
b) 982
c) (1.02)2 - (0.98)2
d) 297 × 303
47) (a) By what number rational should −15/56
be divided to get −5/7
(b)The sum of two rational numbers is 5/18
if one of the numbers is 1/8,find the other number.
48) (a) Two numbers are in the ratio 5:3. If they differ by 18, what are the
numbers?
(b) Rohan is twice as old as Sam. Five years ago Rohan’s age was three
times Sam’s age. Find their present ages.
49) (a)Find the least number which must be subtracted from 2361 to
make it a perfect square.
(b) Find the least square number that is divisible by each of the
numbers 16,18 and 45.
Answers
Answer:
Step-by-step explanation:
4A+2B+3C⟶A
4
B
2
C
3
From the reaction-
No. of moles of element B required to react with 4 moles of element A =2
No. of moles of element B required to react with 2 moles of element A =
4
2
×2=1 mole
Given amount of element B = 1.2 moles
No. of moles of element C required to react with 4 moles of element A =3
No. of moles of element C required to react with 2 moles of element A =
4
3
×2=1.5 moles
Given amount of element C = 1.44 moles
∴ In the given reaction, C is limiting reagent.
Therefore,
No. of moles of product formed when 3 moles of element C react =1 mole
No. of moles of product formed when 1.44 moles of element C react =
3
1
×1.44=0.48 moles
Hence, 0.48 moles product formed.
Answer:
your answer is 0.48
Step-by-step explanation:
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