# How do you conduct a mass balance?

## How do you conduct a mass balance?

How to Use Mass Balance for FLW Quantification

- Step 1: Define your inputs, outputs and stocks. Three key figures – the inputs, the outputs and the stocks – form the basis of the mass balance calculation.
- Step 2: Identify data sources.
- Step 3: Account for any variations.
- Step 4: Perform the mass balance analysis.

**How does a mass balance work?**

In simple terms, a balance measures mass, while scales measure weight. So if you bring a balance and a scale to the moon, the balance will accurately give you the mass of, say, a moon rock, whereas the scale will be affected by the gravity. A balance determines mass by balancing an unknown mass against a known mass.

### How do you do a mass balance?

**What is mass balance equation chemistry?**

➢ Mass-balance equations relate the equilibrium concentrations of various species in a solution to one another and to the analytical concentrations of the various solutes. ➢ These equations are a direct result of the conservation of mass and. moles.

## Why do we use CSTR in series?

The CSTR is always operating a the lowest concentration, the exit concentration. When say two CSTRs are in series, the first operates at a higher concentration, therefore the rate is greater, therefore the conversion is greater. The second reactor in series builds on the conversion in the first reactor.

**How is the total mass of a CSTR measured?**

The mass accumulation rate is, by definition, , or . The total mass in the CSTR cannot usually be measured. For example, if the CSTR represented an entire lake, measuring the total pollutant mass would require analyzing all of the water in the lake.

### How is the flux out of CSTR equal to the concentration in the CSTR?

The flux out of the CSTR is similarly equal to the product of volumetric flow rate in the exit pipe times the concentration in the exit pipe. Since the CSTR is well-mixed, the concentration in the liquid leaving the CSTR is equal to the concentration inside the CSTR. It is conventional to refer to the concentration within the CSTR simply as C.

**What is the mass balance of a batch reactor?**

1. Batch reactor. Given its volume V, and the initial internal concentration c0, the total mass will be M = V·c0. In the unit time, the concentration will be able to change only in virtue of a chemical reaction. The mass balance [6] quantifies this change: IN – OUT + PROD – CONS = ACC.

## What are the different types of mass balance problems?

Mass balance problems can be divided into those that are in steady state and those that are non-steady state. A steady-state situation is one in which things do not change with time—the incoming concentration and flow rate are constant, the outgoing flow rate is constant, and therefore the concentration in the control volume is constant.