Question

10. a) Convert into metre
i) 41 Pm ( Distance of the nearest star)
ii)
7 nm (Diameter of small virus)
b) State the number of significant figures for the following numbers.
i) 2.654 104
ii) 0.003688
iii) 2007
iv) 0.00046738
c) When 4.2 g of NaHCO3 (Sodium hydrogen carbonate) is added to a solution of
CH3COOH (acetic acid) weighing 10.0 g, it is observed that 2.2 g of CO2 is
releaced to the atmosphere. The residue left is found to weight 12.0 g. Show
that these observations are in agreement with law of conservation of mass​

Answer 1

Answer:

Explanation:

10.a)

i)4.1e-11

ii)7e-9

Answer 2

Answer:

41 × 10`25 this is the right answer of this question