What is the mass in grams of 36.70 moles of KBr?

• A. 2450 g
• B. 4390 g
• C. 3260 g
• D. 1200 g

Answer: (B)

Verified step by step guidance

1. Identify the given quantity and what is asked: You have 36.70 moles of KBr and need to find the mass in grams.
2. Find the molar mass of KBr by adding the atomic masses of potassium (K) and bromine (Br). Use the periodic table values: atomic mass of K ≈ 39.10 g/mol and Br ≈ 79.90 g/mol.
3. Calculate the molar mass of KBr using the formula: \(\text{Molar mass of KBr} = 39.10 + 79.90\) g/mol.
4. Use the relationship between moles, molar mass, and mass: \(\text{Mass} = \text{Moles} \times \text{Molar mass}\).
5. Substitute the values into the formula: \(\text{Mass} = 36.70 \times (39.10 + 79.90)\) g to find the mass of KBr.