Question

Calculate the number of moles in 11.7g of Zn(CN)2.

A) 0.1 moles
B) 0.2 moles
C) 0.3 moles
D) 0.4 moles

Answer 1

To calculate the number of moles in 11.7g of Zn(CN)2, divide the mass by the molar mass. The correct answer is A) 0.1 moles.

Step-by-step explanation:

To calculate the number of moles in 11.7g of Zn(CN)2, you need to use the molar mass of Zn(CN)2. The molar mass of Zn is 65.38 g/mol, the molar mass of C is 12.01 g/mol, and the molar mass of N is 14.01 g/mol. Since there are two CN groups, you need to double the molar mass of CN, which is 26.02 g/mol.

Now you can calculate the molar mass of Zn(CN)2: (65.38 g/mol) + (26.02 g/mol)

This gives you a molar mass of 91.40 g/mol.

Finally, divide the mass of Zn(CN)2 by the molar mass to get the number of moles: 11.7g ÷ 91.40 g/mol = 0.128 moles.

Therefore, the correct answer is A) 0.1 moles.