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Kobotan [32]
3 years ago
13

Calculate the density of a rectangular solid which has a mass of 25.71g. It is 2.30cm long, 4.01 cm wide and 1.82 cm high.

Chemistry
2 answers:
pickupchik [31]3 years ago
3 0
V = a x b x c

V = 2.30 x 4.01 x 1.82

V = 16.78586 cm³

D = m / V

D = 25.71 / 16.78586

D = 1.53 g/cm³
faust18 [17]3 years ago
3 0
<span>Density is a value for mass, such as kg, divided by a value for volume, such as m3. Density is a physical property of a substance that represents the mass of that substance per unit volume. Calculation is as follows:

Density = mass / volume = 25.71 g / (</span><span>2.30cm x 4.01 cm x 1.82 cm)
Density = 1.53 g/cm^3</span>
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Determine the oxidation number of each element in these compounds or ions. (a) au2(seo4)3 (gold(iii) selenate) au = se = o = (b)
Stels [109]
<span>                                                    Au</span>₂(SeO₄)₃

                                         O = -2 × 4 = -8
                                             Se  =  + 6
So,
                                            (+6 - 8) = -2

Means (SeO₄) contains -2 charge, Now multiply -2 by 3
                                             
                                             -2 ₓ 3 = -6
Means,
                             Au₂ + (-6) = 0
               
                            Au₂  = +6
Or,
                            Au  =  6 / 2

                            Au  = +3
Result:
                            Au  =  +3
                            Se  =  +6
                            O   =  -2

                                                      Ni(CN)₂


Cyanide (CN⁻) contains -1 charge,
So,
                              N  =  -3
                              C  =  +2
Then,
                                         Ni + (-1)₂  =  0

                                               Ni - 2  =  0
Or,
                                                     Ni =  +2
Result:
                            N  =  -3
                            C  =  +2
                           Ni  =  +2




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