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frez [133]
3 years ago
5

In the formula 5CaSO4 the total number of sulfur atoms present is a. 1. b. 5. c. 9. d. 20?

Chemistry
2 answers:
Ierofanga [76]3 years ago
5 0

Answer:

b. 5

Explanation:

The name of the compound above is calcium tetraoxosulphate . The coefficient is 5 means the compound exist as 5 moles. It simply means 5 moles of CaSO4. The natural chemical formula has 1 atom of calcium, 1 atom of sulfur and 4 atom of oxygen.

Since the compound according to the formula exist in 5 mole. The number of atom of Calcium is 1 × 5 = 5 atoms, Sulfur = 1 × 5 = 5 atoms and oxygen = 4 × 5 = 20 atoms.

The total number of atoms of sulfur in the Formula, 5CaSO4 (Calcium sulphate) is 5 atoms.

podryga [215]3 years ago
4 0
The answer is b . (1*5=5)
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timama [110]

Answer:

100 g

Explanation:

From the question given above, the following data were obtained:

Original amount (N₀) = 400 g

Time (t) = 4 years

Half-life (t½) = 2 years

Amount remaining (N) =?

Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:

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n = 4 / 2

n = 2

Thus, 2 half-lives has elapsed.

Finally, we shall determine the amount remaining of the radioactive isotope. This can be obtained as follow:

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N = 100 g

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3 0
3 years ago
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