Question

during a physical science lab investigating chemical reactions, several students placed a 30g antacid tablet in a zip - lock bag that has a mass of 20g. they recorded the masses of the tablet and the bag. then they added 50 grams of water and quickly sealed the bag. the tablet began to fizz and soon disappeared. the bag was filled with gas. what can you conclude about the amount of gas produced if the mass of the liquid after the reaction is completed is still 50 grams? a 30 grams b 50 grams c 60 grams d 90 grams

Explanation:

Step1: Calculate total initial mass

$20\ \text{g} + 30\ \text{g} + 50\ \text{g} = 100\ \text{g}$

Step2: Calculate total final mass (solid+liquid)

$20\ \text{g} + 50\ \text{g} = 70\ \text{g}$

Step3: Find mass of produced gas

$100\ \text{g} - 70\ \text{g} = 30\ \text{g}$

Answer:

A. 30 grams