Answer:  a)   2.27 g     and     b)  15384
Step-by-step explanation:
Given : An effervescent tablet has the following formula: 
acetaminophen 325 mg, 
calcium carbonate 280 mg, 
citric acid 900 mg, 
potassium bicarbonate 300 mg, and 
sodium bicarbonate 465 mg.
a) When we add all quantities together , we get
The total weight of the ingredients in each tablet = 
Since, 1 gram = 1000 mg
Then, 
Now, 
∴ The total weight of the ingredients in each tablet = 2.27 g
b. 1 kg = 1000g and 1 g = 1000 mg
Then, 1 kg = 
⇒ 5 kg = 5000,000 mg
Now, The number of  tablets could be made with a supply of 5 kg of acetaminophen will be :

Hence, the number of  tablets could be made with a supply of 5 kg of acetaminophen= 15384