1.748/0.76 answer is 2.3 just show method
Answers
Answer:
Correct option is
A
2.16 g
Ag
2
CO
3
(s)→2Ag(s)+CO
2
(g)+
2
1
O
2
(g)
Molecular Weight of Ag
2
CO
3
=276 g
And, molecular weight of Ag=2×108=216 g
276 g of Ag
2
CO
3
give 216 g Ag.
Therefore, 2.76 g of Ag
2
CO
3
on heating will give
276
216
×2.76 g=2.16 g Ag as residue.
Hence, option A is correct.
Answer:
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Division of a Decimal by a Decimal
Division of a decimal by a decimal are discussed here.
1. 14.7 ÷ 2.1
Solution:
14.7 ÷ 2.1
[Count the number of decimal digits in the divisor and we observe that after decimal there is 1 number so we divide the number by 10.]
= 147/10 ÷ 21/10
= 147/10 × 10/21 [reverse it to multiplication]
= (147 × 10)/(10 × 21)
= 1470/210
Now divide the numbers as usual.
Therefore, 14.7 ÷ 2.1 = 7
2. 1.296 ÷ 0.108
Solution:
1.296 ÷ 0.108
[Count the number of decimal digits in the divisor and we observe that after decimal there are 3 numbers so we divide the number by 1000]
= (1296/1000) ÷ (108/1000)
= (1296/1000) × (1000/108)[reverse it to multiplication]
= (1296 × 1000)/1000 × 108)
= 1296000/108000
Now divide the numbers as usual.
Therefore, 1.296 ÷ 0.108 = 12
Step-by-step explanation:
this is not the questions answer but hope u understood