23. The law of constant composition states that combine. a. only one compound ca

Question

23. The law of constant composition states that combine. a. only one compound can be produced when two elements in the same proportions. b. the elements forming a particular compound always combine c. compounds such as NO and NO2 have identical chemical properties. d. nitrogen and oxygen can combine to form NO or NO2. e. compounds such as NO and SO2 have identical chemical properties. 24. What would you report for the mass of three samples weighing 106.2 g, 33.15 g, and 0.028 g? total d. 139.4 g a. 139.38 g e. 139 g b. 139.378 g c. 139.3 g

Explanation / Answer

23)

The law of constant composition says that, in any particular chemical compound, all samples of that compound will be made up of the same elements in the same proportion or ratio.

so, from this we can say that the answer is b.

24)

In the case of addition and substraction, the result cannot have more digits to the right of the decimal point than that at original number which has the least number of digits the right of the decimal point in it.

In the given problem, weight samples are 106.2g, 33.15g, 0.028g.

By the addition of these three values we get, 139.378

But, Among these 106.2 has only one digit after the decimal point and the result should be reported only up to one digit after the decimal point. so, in this 139.378 , the digits 78 should removed. If the digit to be removed is more than 5, the preceding number is increased by one.

there the answer is 139.4g

the correct option is d) 139.4g

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