Question

Determine empirical formula from combustion analysis

- In the combustion of 18.8g of glucose, 27.6g of CO₂ and 11.3g if H₂O are produced. determine the empirical formula of glucose
Step 1: determine the mass of C and H in the original sample
Step 2: determine the mass of O in the original sample
Step 3: determine the CxHyOz mole ratios to find the empirical formula

Answer 1

To determine the empirical formula of glucose using combustion analysis, follow the steps of determining the masses of carbon and hydrogen, the mass of oxygen, and the mole ratios of C, H, and O. The empirical formula of glucose is CH₂O.

Step-by-step explanation:

To determine the empirical formula of glucose using combustion analysis, we need to follow these steps:

Step 1:

Determine the mass of carbon (C) and hydrogen (H) in the original sample.

Step 2:

Determine the mass of oxygen (O) in the original sample.

Step 3:

Use the mole ratios of C, H, and O to find the empirical formula.

In this case, we have 18.8 g of glucose, which produces 27.6 g of CO₂ and 11.3 g of H₂O. From these masses, we can calculate the moles of C, H, and O.

Dividing by the smallest number of moles will give us the mole ratios and the empirical formula of glucose.

The empirical formula for glucose is CH₂O.