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What is the percent yield of iron if the reaction of 64.5 g of iron(III) oxide produces 14.0 g of iron?
Toxic mercury(I) nitrate, Hg 2 (NO 3 ) 2 , solution is added to a sodium hydroxide solution
to form a yellow-orange precipitate.
Lithium has two naturally occurring isotopes: lithium-6 and lithium-7. If the average atomic mass of lithium is 6.941 atomic mass units, which isotope is the most abundant? How do you know?
Calculate the average atomic mass of magnesium using the following data for three magnesium isotopes. (Abundance not in percentage form)
Isotope=(Mg-24, Mg-25, Mg26), Mass(amu)=(23.985, 24.986, 25.983) & Relative abundance=(0.7870, 0.1013, 0.1117
Why Calcium iodate has low solubility in distilled water meanwhile high in Calcium nitrate solution?

Choose a chemical element with the most pronounced non-metallic properties


Ammonia gas
reacted with excess
nitrogen dioxide to
form nitrogen gas
and gaseous water.
What volume ( L) of
ammonia gas at
STP is needed to
form 45 g nitrogen?
a sample of nitrophenol C6H3NO3 contains 13.2 X 10^24 hydrogen atoms. How many moles of nitrophenol are in the sample
Consider the following reaction
2A(g) + B(g) ⇋ C(g)
A mixture containing 1.0 mole of A and 0.75 mole of B is left to attain equilibrium in a 1.0
dm3 flask at 65oC. The equilibrium mixture is found to contain 0.7 moles of A and 0.6 moles of B. Calculate Kc at 65oC.
Identify the Brønsted acid and base in the following reaction and give its conjugate pair.
1. NH3(aq) + HF(aq) ⇋ NH4+(aq) + F-(aq)
2. HCN(aq) + OH-(aq) ⇋ CN-(aq) + H2O(l)
3. HCO3-(aq) + HCO3-(aq) ⇋ H2CO3(aq) + CO32-(aq)
4. HClO(aq) + CH3NH2(aq) ⇋ CH3NH3+ + ClO-(aq)
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