Question

Which of the following has same mass?
(a) 4g of He
(b) 6.023 x 10^23 atoms of He
(c) 1 atom of He
(d) 1 mole atoms of He
Which of the following is/are the best example of law of
conservation of mass?
a)12g of carbon combines with 32g of oxygen to form
44g of CO^2
(b) When 12g of carbon is heated in a vacuum there is no
change in mass
(c) A sample of air increases in volume when heated at
constant pressure but its mass remains unaltered.
(d) 2 g of hydrogen combines with 16 gofoxygen to form
18 g of water.​

Answer 1

Answer:

2. law of conservation of mass :a) option is right

i don't know the 1 one