# What is the molar mass of Sr(NO_2)_2?

Well, the atomic mass of $S r$ is $87.6 \cdot g \cdot m o {l}^{-} 1$....
That of nitrogen is $14.01 \cdot g \cdot m o {l}^{-} 1$; and that of oxygen is $15.999 \cdot g \cdot m o {l}^{-} 1$.
Do you suppose you could do the sum: $\left(87.6 + 2 \times 14.01 + 4 \times 15.999\right) \cdot g \cdot m o {l}^{-} 1$?