ساعدوني راح الوقت عليا كمياء

[ميشو كول]

ارجوكم ساعدوني والله راح الوقت عليا وانا ماني فاهمه شيء
فهموني الاسئله هذي كيف انحلت

[7] A sample of hydrogen gas was collected over water at 21°C 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 21°C.)
[8] (A) 0.283 g
(B) 435 g
(C) 0.571 g #
(D) 7.14 g

[7] What is the wavelength (in nanometers) of light having a frequency of 8.6 × 1013 Hz?

(A) 3.5 nm
(B) 3.5 × 103 nm #
(C) 3.5 ×106 nm
(D) 3.5 ×105 nm

[7] The ground-state electron configuration for Gallium [Ga] is

(A) [Ar] 4s2 3d9 4p2.

(B) [Ar] 4s2 3d10 4p1. #

(C) [Kr] 4s2 3d10 4p1.

(D)[Ar] 4s1 3d10 4p2.

[16] How many unpaired electrons in Cr2+ ion?
(A) 2
(B) 4 #
(C) 6
(D) 1
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[17] The electron configuration of a neutral atom is [Ne] 3s2 3p1. The four quantum numbers of the last electron are:
(A) (2, 1, -1, +1/2)
(B) (3, 3, -1 , +1/2)
(C) (3, 0, -1, +1/2)


[30] The number of resonance structures for the sulfur dioxide ( ) molecule that satisfy the
octet rule is

(A) 1.
(B) 2.#
(C) 3.
(D) none of these



(D) (3, 1, -1, +1/2 )#