When adding the measurements 42.1014 g + 190.5 g, the answer has ___ significant figures.

Determine the formula weights of each of the following compounds. Part A) Nitrous oxide, N2O, known as laughing gas and used as an anesthetic in dentistry. Express your answer using three significant figures.

What is the total number of grams of KCl (formula mass = 74.6) in 1.00 liter of 0.200 molar solution? A) 7.46 g B) 14.9 g C) 22.4 g D) 29.8 g

What is the name of the following covalent compound n2o6

Sam is pushing a cart. How can he make the cart move faster? A) He can add weight to the cart. B) He can push the cart up a ramp. C) He can take the wheels off the cart. D) He can increase the force of his push.

Combustion analysis of a hydrocarbon produced 33.01 g g CO2 C O 2 and 10.15 g g H2O H 2 O. Part A Calculate the empirical formula of the hydrocarbon.

Science is a unique field of thought because it relies on to describe the world. •Observations and experim •Teachers and students •Books and writings •Scientists and statements

Hemoglobin, a protein in red blood cells, carries o2 from the lungs to the body's cells. iron (as ferrous ion, fe2+) makes up 0.33 mass % of hemoglobin. if the molar mass of hemoglobin is 6.8 Ã 104 g/mol, how many fe2 + ions are in one molecule?

What could you predict about a methane molecule that would most likely be made by using both the quantum model of the atom and John Dalton's model?

What is the molar mass of an unknown hydrocarbon whose density is measured to be 1.97 g/l at stp?

Which is an example of flow of heat through conduction