Question

a 2.54 g sample of sodium bromide is added to 32.4 g of water. what is the total mass of the mixture, with the correct significant figures?
○ 34.940 g
○ 34.9 g
○ 35 g
○ 34.94 g

Explanation:

Step1: Add the masses

To find the total mass, we add the mass of sodium bromide (\(2.54\ \text{g}\)) and the mass of water (\(32.4\ \text{g}\)):
\(2.54 + 32.4 = 34.94\ \text{g}\)

Step2: Apply significant figures

When adding, the result should have the same number of decimal places as the least precise measurement. \(32.4\) has one decimal place, so we round \(34.94\) to one decimal place: \(34.9\ \text{g}\).

Answer:

34.9 g