Subtract the sum of all prime numbers betweeb 10 and20 frm the sum off all composite numbers between 10 and 20?
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Subtract the sum of all prime numbers betweeb 10 and20 frm the sum off all composite numbers between 10 and 20?
refer to the attachment
it's Isha
drop some thx
I will mark you brainlist
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Answer:
All prime numbers between 10 and 20 :
11, 13, 17, 19
All composite numbers between 10 and 20 :
12, 14, 15, 16, 18
SUM of prime no.'s
11+13+17+19 = 60
SUM of composite numbers
12+14+15+16+18 = 75
NOW, Difference of sum of prime numbers from the sum of composite numbers
75-60
= 15
Verified answer
Step-by-step explanation:
CaCO3 + 2HCl -----> CaCl2 + H2O + CO2.
2.5g? g
Mass of CaCO3= 40+12+3(16)=52+ 48= 100.
Molar mass of CaCO3=100g.
Mass of CaCl2= 40 + 2(35.5)= 40+ 71= 111.
Molar mass of CaCl2=111g.
Mass of CaCO3 (g) Mass of CaCl2 (g)
For 100g of CaCO
3
, 111g of CaCl_2$$ is formed.
let for 2.5g of CaCO
3
, x g of CaCl
2
is formed.
Thus, by cross multiplication,
x=111×2.5/100=2.775g=2.78g.