A woman lives several miles from this explosion. Which statement is MOST LIKELY true? A) She will see the explosion before she h
ears it. B) She will hear the explosion before she sees it. C) She won't be able to see the explosion, but she'll hear it. D) She won't be able to hear the explosion, but she'll see it.
It depends on the explosion. If it is a large one such as an atomic bomb, the correct answer would be A as light travels faster than sound. If the explosion is smaller like a firework or there are other obstacles impeding visual contact, then the answer would be C because sound cannot be blocked as light can
The composition of NaHCO₃ shows that it contains 1.0 atom of Na, 1.0 atom of H and 3.0 atoms of O.
The molar mass of NaHCO₃ = ∑(no. of atoms x Atomic mass of the element).
Atomic mass of Na = 22.99 g/mole, atomic mass of H = 1.01 g/mole, atomic mass of C = 12.01 g/mole, and atomic mass of O = 16.00 g/mole.
Then, the molar mass of NaHCO₃ = (1.0 x 22.99) + (1.0 x 1.01) + (1.0 x 12.01) + (3.0 x 16.00) = 84.01 g/mole.
To get the percentage of each element using the relation: <em>% composition = [(no. of atoms x its atomic mass) / (molar mass of the compound)] x 100</em>.
The % of Na = (1.0 x 22.99) / (84.01) x 100 = 27.365 %.
The % of H = (1.0 x 1.01) / (84.01) x 100 = 1.20 %.
The % of C = (1.0 x 12.01) / (84.01) x 100 = 14.30 %.
The % of O = (3.0 x 16.00) / (84.01) x 100 = 57.13 %.