What is the mass percent of chocolate chips in a cookie with 150.0 g dough and 25.0 chips?

The mass percent of chocolate chips in the cookie can be calculated using the formula:

$$\text{Mass percent} = \frac{\text{Mass of chocolate chips}}{\text{Total mass of cookie}} \times 100%$$

Given that the mass of the dough is 150.0 g and the mass of the chocolate chips is 25.0 g, we can calculate the total mass of the cookie as:

$$\text{Total mass} = \text{Mass of dough} + \text{Mass of chocolate chips}$$

$$\text{Total mass} = 150.0 \text{ g} + 25.0 \text{ g} = 175.0 \text{ g}$$

Therefore, the mass percent of chocolate chips in the cookie is:

$$\text{Mass percent} = \frac{25.0 \text{ g}}{175.0 \text{ g}} \times 100\% = \boxed{14.3\%}$$