4
Numbers above zero are significant, as well as any zeros that appear in between two non-zero numbers.
Answer:
The answer is C. 48 grams
Explanation: If the mass of all the ingredients is 48 grams the that would be your in total answer
Its 100% B. my dude because the atomic theory doesn't state anything else
Answer:

one atom of an element = 6.02 \times {10}^{23} atom
The mass of one atom of sulphur = 32g
The mass of one atom of aluminium = 27g
so one atom of aluminium = 6.02 \times {10}^{23}
27g of AL = 6.02 \times {10}^{23} atom
2.70g of AL = X atoms
Then you cross multiply ........
and get the answer
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It should be cell, neutron, atom, and electron. If not then I’m so sorry