Question

on monday, tyler put a 50-gram ice cube in a 50-gram cup. over the next few days, the ice melted into liquid water, and some of the water evaporated. on thursday, the 50-gram cup had 20 grams of water in it. complete the bar graph to show the mass of the water vapor. masses before and after the change (graph with cup, ice, cup, water, water vapor bars)

Explanation:

Step1: Find total mass before

Before, ice is 50g, cup is 50g. Total mass: \( 50 + 50 = 100 \)g.

Step2: Find total mass after

After, cup is 50g, water is 20g. Let water vapor be \( x \)g. Total mass: \( 50 + 20 + x \).

Step3: Apply conservation of mass

Since mass is conserved, \( 50 + 50 = 50 + 20 + x \). Solve: \( 100 = 70 + x \) → \( x = 30 \)g.

Step4: Draw bar for water vapor

The bar for water vapor should reach 30 grams on the y - axis.

Answer:

The mass of water vapor is 30 grams, so the bar for "water vapor" in the graph should be drawn to the height of 30 grams (on the y - axis marked in grams).