اللي يرد علي له دعوه حلوه.. بخصوص الكيمو

[مكعباات عبودي]

انا مافهمت هذي الاسئله وماعرفت احلها حاولت بس مايطلع لي نفس النتائج الله يسعدكم اللي يعرف اي شي منها يكتب لي الطريييقه

[5] A sample of gas weighs 0.250 g and occupies a volume of 112 cm3 at STP. The molecular weight of this gas is:
(A) 54.5 g mol-1
(B) 50 g mol-1
(C) 2.23 g mol-1
(D) 8 g mol-1

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"The pressure of a fixed amount of gas at a constant temperature is inversely proportional to the volume of the gas" is a statement of:
(A) Charles' law
(B) Boyle's law
(C) Avogadro’s law
(D) Bohr's equation

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What is the total number of orbitals in the n = 3 level?
(A) 2
(B) 8
(C) 9
(D) 3

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A recorded pressure in Jeddah city is 109 kPa. What is the pressure in cmHg?
(A) 83.2
(B) 78.8
(C) 76.4
(D) 81.8 #

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A sample of hydrogen gas was collected over water at 21C and 0.9 atm. The volume of the container was 7.80 L. Calculate the mass of H2(g) collected. (Vapor pressure of water = 0.025 atm at 21C.)
(A) 0.283 g
(B) 435 g
(C) 0.571 g #
(D) 7.14 g


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