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anastassius [24]
3 years ago
15

Find the mass of 250.0mL of benezene. The density of benezene is 0.8765 g/mL

Chemistry
2 answers:
kkurt [141]3 years ago
8 0

Answer: Mass = 219.1 g

Explanation: To solve for the mass of benzene we will use the formula for density which is d = m/V.

Derive to find the mass, m= dV

m = 0.8765 g/mL ( 250.0 mL)

= 219.1 g

Cancel out mL, and the remaining unit is in grams.

adoni [48]3 years ago
3 0

Answer:219.125g

Explanation:

Density=0.8765g/ml

Volume=250.0ml

Mass=density x volume

Mass=0.8765 x 250

Mass=219.125g

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230 90Th  -------> 226  88Th  +  4 2 He

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An aqueous solution of calcium hydroxide is standardized by titration with a 0.120 M solution of hydrobromic acid. If 16.5 mL of
Artist 52 [7]

<u>Answer:</u> The molarity of calcium hydroxide in the solution is 0.1 M

<u>Explanation:</u>

To calculate the concentration of base, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is HBr

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is Ca(OH)_2

We are given:

n_1=1\\M_1=0.120M\\V_1=27.5mL\\n_2=2\\M_2=?M\\V_2=16.5mL

Putting values in above equation, we get:

1\times 0.120\times 27.5=2\times M_2\times 16.5\\\\M_2=0.1M

Hence, the molarity of Ca(OH)_2 in the solution is 0.1 M.

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