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Furkat [3]
3 years ago
9

Write these numbers rounded to the three nearest significant figures

Chemistry
1 answer:
Savatey [412]3 years ago
7 0

Answer:

(a) 52.2 mL helium

(b) 18.0 g nitrogen

(c) 78.5 mg MSG

(d) 23,600,000 mm wavelength

(e) 0.00420 kg lead

Rounded the numbers to three nearest significant figures.

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would be the correct answer.  Hope this helps!

Explanation:

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3 years ago
A solution contains 0.775 g Ca2 0.775 g Ca2 in enough water to make a 1925 mL1925 mL solution. What is the milliequivalents of C
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Answer: There will be 0.00002 meq per Liter of the solution.

Explanation:

Normality is defined as the umber of gram equivalents dissolved per liter of the solution.

Normality=\frac{\text{no of gram equivalents} \times 1000}{\text{Volume in ml}}

Normality=\frac{\text{given mass}\times 1000}{\text {Equivalent mass}\times {\text{Volume in ml}}}

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{\text{Equivalent weight}}=\frac{40}{2}=20g

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Thus there will be 0.00002 meq per Liter of the solution.

3 0
4 years ago
4. Ammonia is produced by the chemical reaction of nitrogen and hydrogen. N2 (g) + 3H2(g) →→ 2NH3 (9) (A) Calculate the number o
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Answer:

a) No. of moles of hydrogen needed = 5.4 mol

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N_2 (g)  +  3H_2(g) \rightarrow 2NH_3 (g)

a)

No. of moles of nitrogen = 1.80 mol

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b)

No. of moles of hydrogen = 2.4 mol

It is given that nitrogen is present in sufficient amount.

3 moles of hydrogen produce 2 moles of NH_3

2.4 moles of hydrogen will produce

                              = \frac{2}{3} \times 2.4 = 1.6\ mol\ of\ NH_3

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Mass in gram = No. of moles × Molar mass

Mass of ammonia in g = 1.6 × 17

                                    = 27.2 g

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3 years ago
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