To determine the percent composition of Cr in the compound, we need to first find the mass of Cr in the sample. We can use the given information to calculate the total mass of the compound, and then use the mass of Cr to determine its percent composition.
The total mass of the compound is 50.0 g, which is the sum of the masses of each element:
50.0 g = 14.19 g Na + 19.76 g O + 16.05 g Cr
The mass of Cr in the sample is 16.05 g, which represents its percent composition in the compound. To express this as a percentage, we can divide the mass of Cr by the total mass of the compound and multiply by 100%:
percent composition of Cr = (16.05 g / 50.0 g) x 100% = 0.3210 x 100% = 32.10%
Thus, the percent composition of Cr in the compound is approximately 32.10%.