General Chemistry Answers

arrange the following species in the order of decreasing size ne, na+ and mg+

6) The energy (in J) required for an electronic transition in a Bohr hydrogen atom from n = 2 to n = 3 is:

A. 4.0 * 10^-19

B. 3.0 * 10^-19

C. −3.0 * 10^-19

D. −7.9 * 10^-19

E. 4.6 * 10^-14

Draw the Lewis diagrams for the two species NH₃ and NH₂^-, which have different H-N-H bond angles, 107.5° and ~ 104.5° respectively. Very briefly explain the variation of the bond angle values.

Is the charge on the molecules always zero ? If not then why do we assume that it is zero while calculating the Oxidation state of a particular atom in that molecule ?

Can hydrogen bonds form among hydrogen chloride molecules,HCI ?Justify your answer

100cm³ of oxygen that fixed through an office in 60 seconds while it take 120seconds for the same office. h=1 o=16?

Calculate the %hydration for each common crystalline hydrate and complete the table.

Formula %hydration

KAl(SO4)2·12H2O

CuSO4·5H2O

MgSO4·7H2O

FeSO4·7H2O

CaSO4·2H2O

NaCO3·H2O

Please show calculation to FeSO4·7H2O

The combustion of gasoline produces carbon dioxide and water. Assume gasoline to be pure octane (C8H18) and calculate how many kilograms of carbon dioxide are added to the atmosphere per 2.6 kg of octane burned. ( Hint: Begin by writing a balanced equation for the combustion reaction.)

mCO2 = ---- kg

If the percent yield for the following reaction is 65.0%, how many grams of KClO₃ are needed to produce 6.00 g of O₂?

2 KClO₃(s) → 2 KCl(s) + 3 O₂(g)

a. 24.0 g

b. 9.95 g

c. 52.9 g

d. 15.3 g

e. 23.6 g

Magnesium hydroxide, the active ingredient in milk of magnesia, neutralizes stomach acid, primarily HCl, according to the reaction: Mg(OH)2(aq) + 2 HCl(aq) → H2O(l) + MgCl2(aq) How much HCl in grams can be neutralized by 3.43 g of Mg(OH)2 ?

mass = ----g

Ammonia can also be synthesized by the reaction:

3H2(g)+N2(g)→2NH3(g)

What is the theoretical yield of ammonia, in kilograms, that we can synthesize from 5.27 kg

H2 and 31.9 kg of  N2?

theoretical yield of  NH3 = ---- kg