What is the mass in kg of 4.02 x 102 mol K2Cr2O7?Question 4Select one:a.1.18 x 105 kgb.1.18 x 102 kgc.1.37 x 10-3 kgd.1.37 x 10-6 kge.1.18 kg
Question
What is the mass in kg of 4.02 x 102 mol K2Cr2O7?
Question 4 Select one:
- a. 1.18 x 105 kg
- b. 1.18 x 102 kg
- c. 1.37 x 10-3 kg
- d. 1.37 x 10-6 kg
- e. 1.18 kg
Solution
To solve this problem, we need to use the molar mass of K2Cr2O7, which is 294.185 g/mol.
Step 1: Convert the molar mass from g/mol to kg/mol. 1 g = 0.001 kg, so 294.185 g = 0.294185 kg.
Step 2: Multiply the given moles of K2Cr2O7 by the molar mass in kg to find the mass. Mass = moles * molar mass = 4.02 x 10^2 mol * 0.294185 kg/mol = 118.2017 kg
So, the mass of 4.02 x 10^2 mol K2Cr2O7 is approximately 1.18 x 10^2 kg.
Therefore, the correct answer is b. 1.18 x 10^2 kg.
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