If the total mass of the reactants is 49g then the mass of the products also equals 49g.
It is due to the law of conservation of mass.
Mass can neither be created nor be destroyed.
Answer: it measures temperature
Explanation:
Base your answers to the following questions on the graph below, which shows the effect that average yearly precipitation and temperature have on the type of weathering that will occur in a particular region.
City
Avg. Yearly Temp (oC)
Avg. Yearly Precip (cm)
Albany, NY
9oC
98 cm
Washington, D.C.
15oC
111 cm
Phoenix, AZ
20oC
22 cm
The percentages are given in weight. You need to transform them into moles.
Take a basis of 100 grams of compound. Then there are 69.94 grams of iron and 30.06 grams of oxygen.
Use the atomic masses of iron and oxygen to obtain each number of moles.
Molar mass of iron: 55.85 g/mol
# moles of iron = 69.94 g / 55.85 g/mol = 1.252
Molar mass of oxygen: 16 g/mol
# moles of oxygen = 30.06 g / 16 g/mol =1.87875
Proportions
1.87875 moles of Oxigen/ 1.252moles of iron = 1.50 /1
3moles of Oxygen: 1 mol of Iron
Empirical formula: FeO3
Molar mass of the empirical formula: 55.85 g/mol + 3(16g/mol) = 103.85 g/mol
Molar mass of the compound / molar mass of the empirical formula = 199.55 g/mol / 103.85 g/mol = 1.92
Round to 2.
Then the molecular formula is the empirical formula times 2.
Fe2O6
