Why do you say that is the right answer

If enough oxygen is present for 132g of propane (C3H8) to burn completely in the given reaction, what mass of water is produced? Give your answer in grams, rounded to nearest gram. Reaction: C3H8 + 5O2 > 3CO2 + 4H20 Answer:

Two substances each have a temperature of 23 degrees Celcius. After they are combined the temperature rises to 27 degrees Celcius. What evidence proves a chemical reaction occurred?

Zachary adds 26.45 g to 2.55 g. How many significant figures should his answer have? two three four five

Calculate the mass percent of sr (no3) 2 in this solution, assuming the density of the solution is 1.000 kg/l.

Select all that apply. The weight of an object: changes slightly with location on the earth decreases with height above sea level does not change from planet to planet

Butane gas is used as the fuel in disposable lighters. It burn in oxygen to form carbon dioxide gas and water vapor. What mass of carbon dioxide is produced when 53.3 g of butane is burned in 103.9 g of oxygen

Suppose a solution was too concentrated for an accurate reading with the spectrophotometer. The concentrated solution was diluted by placing 1.00 mL of the concentrated solution in 4.00 mL of water.

What kinds of scientific investagations involve making observations

According to the kinetic molecular theory, when a gas particle hits something what will happen?

Protons and neutrons are made from which of the following? hadrons down quarks only up quarks and down quarks up quarks only