General Chemistry Answers

How many molecules are there in 4.6g of ethanol

3.9104 g sample of a compound made of carbon, hydrogen, nitrogen, and oxygen is

burned completely 3.820 g CO2 and 3.125 g H2O are produced. Analysis of nitrogen showed that the compound contains 46.62 % by mass nitrogen. The molar mass of the compound is about 170 + 15 g/mole.

Calculate the empirical formula of the compound.

What is the molecular formula of the compound?

A mixture of cobalt(II) oxide and cobalt(III) oxide contains 32.50 % by mass cobalt (II) oxide. What is the total number of oxide ions in a 122 g of the mixture?

A compound with the formula, BxH20O3, contains 36.14 % by mass oxygen. What is the  value of the integer, x ?

An irregularly-shaped piece of chromium (Cr) has a mass of 65.0 grams. What is the volume in cm³ of this piece of chromium if its density is 7.19 g/cm³?

A 1.50g sample of a compound, consisting of element chromium and chlorine, was dissolved completely in water. The solution was added to excess silver nitrate solution, AgNO₃ . All the chlorine from the sample was converted to 4.074g of silver chloride precipitate, AgCl. Determine the mass of chlorine and chromium

A) What mass of H2C2O4 is present in a 25cm3 sample if it is titrated to its equivalence point with 18.09 mL of 0.2235 M NaOH? The balanced chemical reaction is as follows: H2C2O4+2NaOH→Na2C2O4+2H2O.  

B) What is the mass concentration of H2C2O4 in the sample