What is the mass in grams of NaCN in 120.0mL of a 2.40x10-5 M
solution?

ANSWER: 1.41 x grams

EXPLANATION:

1. The formula for mass is m=nM therefore we need to find moles (n) because we don't have that yet.

n = ( × ) x 0.12     (I converted 120.0 mL to L, which makes it 0.12)

n = 0.00000288 mol

2. Now we can find the mass.

m = n x M

m = 0.00000288 x 49.0072   (molar mass, M, of NaCN is 49.0072)

m = 0.00014114073 grams ≈ 1.41 x grams

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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