Question

a scanning tunneling microscope allows imaging of ______ particles.
a) submicroscopic
b) symbolic
c) macroscopic
d) microscopic
question 4 (5 points)
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if 200.4 g of water is mixed with 101.42 g of salt, the mass of the final solution would be reported as
a) 302 g
b) 301.8 g.
c) 300 g.

Explanation:

Step1: Calculate the total mass

The mass of the solution is the sum of the mass of water and salt.
$$200.4 + 101.42=301.82$$

Step2: Round to the correct number of significant figures

For addition, we look at the decimal places. 200.4 has one decimal place and 101.42 has two decimal places. We round to the least number of decimal places (one decimal place).
$$301.82\approx301.8$$

Answer:

B) \(301.8\) g