Answer: they giving you some hard question
Explanation:
i dont know know what the answer is do you have any answer options
Answer:

Explanation:
Assuming that all caculations are at normal pressure and -1.72°C :

Where
is the number of moles of hydrogen
is the mass of hydrogen
is the density of hydrogen
1.2 x 10^10 mm^3 is equivalent to 12.0 m^3
Answer:
this is a required answer. look it once.
Cutting of Nails is a Physical Change since no new substance is formed.
Don't confuse it with Reversible and Irreversible Changes