Can someone help me with these

4.  204.00 g

5.  0.23 g/cm³

6.  578.93 g

7.  9.21 g/mL

Explanation:

I answered 1-3 on the first question you posted.

If you are using the formula, d = mv, you can simply plug in the values into the correct spot.  d is density, m is mass, and v is volume.

4.  Density is 13.6 g/mL.  Volume is 15.0 mL.  Mass is unknown.

d = m/v

13.6 = m/(15.0)

13.6 × 15.0 = (m/(15.0)) × (15.0)

204 = m

m = 204.00 g

5.  For this problem, you are given a side length instead of a volume.  You can find volume using this side length.  The side length is 3.86 cm.

V = s³

V = (3.86 cm)³

V = 57.512 cm³

V = 57.51 cm³

Now, you have volume which is 57.5 cm³.  Mass is 13.4 g.  Find density.

d = m/v

d = (13.4 g)/(57.5 cm³)

d = 0.23 g/cm³

6.  You have side lengths of 15.5 cm, 10.0 cm, and 4.5 cm.  Find volume.

V = lwh

V = (15.5 cm)(10.0 cm)(4.5 cm)

V = 697.5 cm³

Volume is 697.5 cm³.  Density is 0.830 g/cm³.  Find mass.

d = m/v

0.830 g/cm³ = m/(697.5 cm³)

(0.830 g/cm³) × (697.5 cm³) = m/(697.5 cm³) × (697.5 cm³)

578.93 g = m

m = 578.93 g

7.  The difference in volume measured in the graduated cylinder is the volume for the object.

27.3 mL - 22.5 mL = 2.8 mL

Volume is 2.8 mL.  Mass is 25.8 g.  Fine density.

d = m/v

d = (25.8 g)/(2.8 mL)

d = 9.21 g/mL

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