Chemistry Answers

Calculate the number of formula units of Li2CO3 present in a 0.500g sample of lithium carbonate. Li=7, C=12, O=16

What volume of a 0.300 M solution of aluminum fluoride would be required to obtain 14.0 g of aluminum fluoride

HOW MUCH ENERGY IS REQUIRED TO HEAT 80 grams of water from 26°C to 48°C ? the

specific heat capacity of water is 4.184 J/g °C.

The allowed concentration level of vinyl chloride, CHCL in a chemical plant is

Calculate the mass, in grams, of iron(II) sulfate that must be added to a 500-mL volumetric flask in order to prepare 500 mL of a 0.196 M aqueous solution of the salt.

A solid sample known to consist of approximately equal amounts of two or more of the following soluble salts. AgNO, ZnCL K.CO, MgSO, Ba(C2H302)2NH4NO3 A sample of the solid, sufficient to give least 0.04 mol of any single salt, was added to 100 mL of water, yielding a white precipitate and a clear solution. The precipitate was collected and rinsed with water. When a portion of the precipitate was placed in dilute HNO,, it completely dissolved. leaving a colorless solution. A second portion of the precipitate was placed in dilute HCI, yielding a precipitate and a clear solution. Finally, the filtrate from the original precipitate was treated with excess NH₁, yielding a white precipitate. Indicate which of the soluble salts must be present in the sample, which must be absent and those for which there is insufficient information to make this determination

A 38.63-mg sample of potassium ozonide, KO,, was heated to 70 °C for 1 h, undergoing a weight loss of 7.10 mg. Write a balanced chemical reaction describing this decomposition A 29.6-mg sample of impure KO, experiences a 4.86-mg weight loss when treated under similar condition. What is the w/w KO, in the sample?

Each of the containers has the same temperature. In which container does the nitrogen exert the highest pressure

Suppose you have water (H2O) where the hydrogen atoms are primarily hydrogen-1

isotopes. You will use this water as a solvent and as a source of H-bonds. What do

you think is the effect in the experiment when all hydrogen atoms are replaced with

deuterium (hydrogen-2)?

A sample of 16 g of tin(IV)oxide is mixed with 2.40 g of carbon and heated.

A reaction : SnO2 +2C = Sn+2CO

Show by calculation that the reagent is more than tin(IV)oxide! (AR values: Sn= 118.7, C= 12, O= 16)