Please answer all page Thank you isBils? which following statements mixtures. th

Question

Please answer all page Thank you isBils? which following statements mixtures. the atoms, A) always periodic table exist elements exist atoms as Compounds can as atoms or molecules, exist D) 240s Kelvin equals D) 6819C 135°C B 273 F What is the mass of a 62 ml sample A) 135 F has a of 252Fams, ample of alyeerol of glycerol? 3.1x 10 g D) 78 g B) 749 g 4 Which of the following pairs compounds does not illustrate the Law of Multple of Which one of de following tatements about anomic structure issuer? A) An atom is mostly empty space. concentrated in the nucleus. Almost all of the mass of the atom is C The protons and neutrons in the nucleus are very tightly packed. atom. D The number of protons and neutrons is always the same in the neutral 20 p ,19 n .and 20 e ,A) 20 .19n', and 19 e P,20s, and 19 1. which of following pairsofname and formula is A) iodine trichloride, ICI, B) phosphoric acid, HsPOs C)barium phosphate, BaPo. D) ammonium carbonate, (NH COs &How; many moleculesef hydrogen sulfide Hs, are ina Toogsample of this gas? A) 2961 10 molecules B) 123 x 10" molecules o2003 molecules D) 682 x molecules

Explanation / Answer

1)

D) compounds can exist as atoms or molecules- False

2) 408K =408-273 = 135 0c

3) 25.2 g /20 ml = 1.26 g/ml

then, mass of 62 ml =  1.26 g/ml * 62 ml

= 78 g

4) c) H2O and HCl

5) D)

6) A)

7) A)

8) B) one mole of H2S = (2+32)= 34 g. and 6.022*10^23 molecules.(Avogadros constant).

Therefore, 70 g= 70 g / 34 g= 2.0588 moles.

which is equivalent to = 2.0588* 6.022*1023 = 12.398*1023 molecules

Hence, 70 g of H2S = 1.23*1024 molecules  

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