Question

1. What is the mass of sulphur in combination with 3.0g of carbon in CS2 ?

2. Which of the following contains smallest number of atoms ?
(a) 1g of CO2
(b) 1g of C8H18(l)
(c) 1g of C2H6(g)
(d) 1g of LiF(s)

3. Which of the following is artificial element made by man ?
(a) gallium
(b) iron
(c) helium
(d) americium

Answer 1

1). c + s → CS2
during reaction 12 grams of carbon combines with 32 grams of sulphur to form carbon disulphide.
Given 3 grams will combine with X grams of sulphur to form CS2.
X = (3*32)/12
= 8 grams
3 grams of carbon combines with 8 gram of sulphur to form CS2.
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2). The smallest number of atoms is 1g of C8H18(I).
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3). Americium is the artificial element made by man .

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Answer 2

Answer:

. your answer is 16.