General Chemistry Answers

The neutralization reaction between hydrochloric acid (HCI) and calcium hydroxide [Ca(OH)2] produces calcium chloride )CaCl2) and water.

2hCl(aq) + Ca(OH)2(s) 🠖 2H2O(l) + CaCl2(aq)

If 0.75 grams of Ca(OH)2 is used in the reaction, determine the following:

a. Mass of HCl (MW=36.64 g/mol)needed to completely react with Ca(OH)2. The molar mass of Ca(OH)2 is 74.10 g/mol.

b. Mass of CaCl2 is (MW=110.98 g/mol) formed in the reaction.

Magnesium metal reacts quantitatively with oxygen to give magnesium oxide, MgO. If 5.00g of Mg and %.00g of O2 are allowed to react, what weight of MgO is formed; and what weight of which reactant is left in excess?

a 13 g sample of an isotope of strontium-90 was formed in 1960 explosion of an atomic bomb at Johnson Island in the pacific test site. in wha year will only 0.625 grams of the strontium-90 remain?

The toxic gas, hydrogen fluoride, HF, is produced from the double displacement reaction of calcium fluoride, CaF2, and concentrated sulfuric acid H2SO4. Starting with 10.0 g of CaF2 and 15.5 g of H2SO4, how many grams of HF will be produced?

Hydrogen always has one proton in each of its 

atoms, oxygen has eight protons and all copper atoms 

have 

Lead is a poisonous metal that especially affects children because they retain a larger fraction of lead than adults do. Lead levels of 0.250ppm in a child cause delayed cognitive development. How many moles of lead present in 1.00g of child’s blood would 0.250ppm represent.

A 10.0 gram sample of a compound consisting solely of sulfur and oxygen contains 4.00 grams of sulfur. What is the empirical formula of the compound?

 How does your mix compare with nature’s mix for the same element in determination of the RAM

Magnesium ribbon reacts with hydrochloric acid to produce hydrogen gas

and magnesium chloride. Describe how this reaction could be used to

determine the relative atomic mass of magnesium.   

You will have a 500 mL solution of salt water from this you will take 10 mL and place it on the balance you find out the 10 mL solution has a mask of 12.1 g what is the density of the 500 mL of salt water solution in grams per milliliter