A chemist burns 160.0 g of Al in excess air to produce aluminum oxide, Al2O3. In the experiment she producds 260.0 g of solid aluminum oxide. The balanced chemical equation is: 4 Al + 3 O2  2 Al2O3 a. Determine the theoretical yield. b. Determine the percent yield. 4. In the reaction of Zn with HCl, 140.15 g of ZnCl2 was actually formed, although the theoretical yield was 143 g. What was the percent yield? 5. 12.5 g of copper are reacted with an excess of chlorine gas, and 25.4 g of copper(II) chloride are obtained in the experiment. Calculate the theoretical yield and the percent yield. Cu + Cl2  CuCl2

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  

the answer is d.) potassium

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.