Determine the empirical formula for a compound that has the following analysis: a 13.07 g sample of an unknown substance is composed of 9.48 g of barium, 1.66 g of carbon, and 1.93 g of nitrogen

Empirical Formula for given compound Ba1C2N2.

Explanation:

Step 1; convert the mass of each element into their molar values by dividing available mass by molar masses.

Molar masses of required elements are as follows; Ba- 137.327, C- 12, N- 14.

Step 2; Divide all the values by the smallest mole value. For given compound  after dividing the masses by molar masses we get 0.0690, 0.1383, 0.1378 for elements Ba, C, N respectively. Divide all three values with the least value which is 0.0690 and note these values.

Step 3; Convert all the numbers available into whole numbers by multiplying with suitable values. i.e. 3 if values are 0.33, 2 if values are 0.5 etc.  

Step 4; Assign these values to corresponding elements and you will get the above empirical formula.

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e