A liquid contains 100 cm3 of water and 40 cm3 of ethanol. If the densities of water and ethanol are 1 g/cm3 and 0.78 g/cm3 respectively. Determine the density of the mixture. 2. The diagram below show

$$
M_w = \rho_w \times V_w = 1 \, \text{g/cm}^3 \times 100 \, \text{cm}^3 = 100 \, \text{g}
$$

$$
M_e = \rho_e \times V_e = 0.78 \, \text{g/cm}^3 \times 40 \, \text{cm}^3 = 31.2 \, \text{g}
$$

$$
M_{total} = M_w + M_e = 100 \, \text{g} + 31.2 \, \text{g} = 131.2 \, \text{g}
$$

$$
V_{total} = V_w + V_e = 100 \, \text{cm}^3 + 40 \, \text{cm}^3 = 140 \, \text{cm}^3
$$

$$
\rho_{mixture} = \frac{M_{total}}{V_{total}} = \frac{131.2 \, \text{g}}{140 \, \text{cm}^3} = 0.937 \, \text{g/cm}^3
$$
The density of the mixture is $\boxed{\text{0.937 g/cm}^3\text{}}$.

Total reading = Main scale reading + Thimble scale reading = $5.00 \, mm + 0.