General Chemistry Answers

How many moles of CaO are there in 250 g of CaO? 

Which of the following would require more energy to remove an electron? Why?

Sodium vs. Chlorine

Lithium vs. Cesium

Balance the redox reaction equation using the oxidation number method.

PbO2   + HBr  à  PbBr2  + O + H2O

what is the ratio of solubility if a 892 mg of sample can be dissolved in 1L of solvent?

2.56g of impure copper sulphate sample was dissolved in in water and precipitated with sodium hydroxide.if 1.234g of copper hydroxide was obtained,what is percentage of copper sulphate in the impure sample?

A swimming pool that is 3.05 m wide by 6.10 m long has an average depth of 2.75 m. The density of water is 1.00 g/cm³. What is the mass of water in the pool when it is filled?

The density of diamond is 3.51 g/cm³. What is the volume of a 1.00-carat diamond? One carat is 200 mg.

A flask that weighs 345.8 g is filled with 225.0 mL of carbon tetrachloride. The mass of the flask and carbon tetrachloride is found to be 703.55 g. Calculate the density of carbon tetrachloride.

A crown weighs 1325 g and has a volume of 124 cm³. What is the density of the crown? Is the crown made of pure golds?

What is the mass no. of a phosporus atom with 16 neutrons?