Two. All nonzero digits are significant.
88
64
64
8*8=64 , 6+4=10, 64 is two digit number That's
The atomic mass of sodium is 22.989, so that 64 grams of it contain 64/22.989 = 2.8 moles, to the justified number of significant digits. The number of particles in a mole of atoms is known as Avogadro's number and is about 6.022 X 1023. Therefore, the sodium contains 1.7 X 1024 and the nitrogen contain 1.8 X 1024.
24+24+12+4=64.
37
10
The gram-atomic mass of sulphur is 32 and that of oxygen is 16, to two significant digits. Therefore, the mass of oxygen with the same number of atoms as 64 grams of sulphur can be found from the proportion m/64 = 16/32, or m = 32 grams.
0.467
64
64