What is the percentage by mass of chromium in sodium dichromate (VI) Na2
Cr2
O7
?​

39.7%

Explanation:

To obtain the percentage composition of chromium (Cr) in Na₂Cr₂O₇, do the following:

Molar mass of Na₂Cr₂O₇ = (23×2) + (52×2) + (16×7)

= 46 + 104 + 112

= 262 g/mol

Mass of Cr in Na₂Cr₂O₇ = 2 × 52 = 104 g

Percentage composition of Cr = mass of Cr / Molar mass of Na₂Cr₂O₇ × 100

= 104 / 262 × 100

= 39.7%

Thus, the percentage composition of chromium (Cr) in Na₂Cr₂O₇ is 39.7%

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them