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oksano4ka [1.4K]
3 years ago
10

Please help me thank you :)

Chemistry
2 answers:
LenaWriter [7]3 years ago
5 0

Answer:

D. 3220

Explanation:

1 km equals 1000 m, so 3.22 km is

3220 m

liq [111]3 years ago
4 0
The answer is D.3220
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How many grams are in 11.9 moles of chromirum
faust18 [17]

Answer:

Explanation:

Method 1 proportion

1 mole of chromium is 52 grams

11.9 moles = x grams

1/11.9 = 52/x                    Cross multiply

x = 11.9 * 52

x = 618.8                         grams

Now I have used an approximate mass for Chromium. The answer you get here is expected to reflect the weigth given on your periodic table Use that to get your answer. You should give a number very close to mine. Round to 3 places as in 619.

Method Two  Formula

mols = given mass / molecular mass

11.9 = given mass /  51.9961          Multiply both sides by  51.9961

11.9 *51.9961  = given mass            

given mass = 618.75

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6 0
3 years ago
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saw5 [17]
Answer:

Colors are seen by burning of metal salts, for example Sodium chloride makes yellow frame.
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A. What colors are exhibited by chromium in its<br> common oxidation states?
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