Atomic mass Ca = 40.078 a.m.u
40.078 g -------------------- 6.02x10²³ atoms
72.8 g ---------------------- ??
72.8 x ( 6.02x10²³) / 40.078 =
4.38x10²⁵ / 40.078 = 1.093x10²⁴ atoms
hope this helps!
The answer is A i think from the options though the answers are worded a bit weird
Answer:
H2O2
Explanation:
There's hydrogen and ox in the formula to represent
They may break bonds,form new compounds, new ions etc...
C. pollute water and damage aquatic ecosystems