Troy Copper
Posted in Uncategorized on 06/17/2009 10:20 pm by admin
Help Please its Urgent im confused and i want to go to bed? 10 easy points!!!!!?
I need help with my homework.. I’m confused with these problems and i really want to go to bed so i really need help… I will reward 10 pts. to best answer!! Thanks…..
1. A troy ounce is equal to 480 grains, and 1 grain is equal to 64.8 milligrams. If the price of gold is $560 per troy ounce, what is the cost of 1 g of gold?
2. 3 students use a meterstick with millimeter markings to measure a length wire. Their measurements are 3cm, 3.3 cm, and 2.87 cm, respectively. Explain which answer was recorded correctly.
3. The accepted density for copper is 8.96g/mL. calculate the percent error for each of these measurements..
a. 9.00g/mL
Thanks so much!!
1.
1 troy = 480 grains
1 grain = 64.8 mlgrams
=> 1 troy = 480*64.8 = 31,104 mlgrams
1 troy = $560 => 1 mlgram = $560/31104 = 1,80041152 (cent)
2. Manual measurement is object to approximation, that being ±0.3 cm in this question, therefore the middle result should be most acceptable.
3.
a. ±0.04 g/mL
b. ???
Good night.~
Troy – Copper State Horse Show ridden by daizeydukes round #2
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