Chemistry anyone? [D=M/V]?

Question

alright...I stink at Honors chemistry.

1. Volume- 45 cm3 [cubed]

Density- 1.05g/ml

Mass- ?

2. Mass- 3.5 g

Volume- ?

Density- 3.6g/cm3

3. if the density of an unknown liquid us 3g/ml and the volume is 15 liters how many grams are there?

Answer 1

The formula for density is D = mass / volume. Therefore, mass would be equal to Density x Volume. Volume would be equal to mass / density. Note than 1mL = 1cm^3.

1.

Mass = (1.05g/mL) x ( 45 mL)

Mass = 47.25grams

2.

Volume = 3.5g/ 3.6g/cm^3

Volume = 0.97cm^3 = 0.97mL

3. Convert 15 liters to milliliters first.

1 L = 1000 mL

15 L = (1000 x 15)mL

15 L = 15,000mL

mass (g) = d x v

mass = 3g/mL x 15,000mL

mass = 45,000grams

Answer 2

Honors chem, and you're already having trouble with density calculations???   Perhaps you need a trip to the guidance dept.

Density = mass / volume

or

D = m / V

1. solve for mass

m = V x D

m = 45 cm^3 x 1.05 g/cm^3

m = 47 g  (to 2 sig figs)

2. solve for volume

V = m / D

V = 3.5 g / 3.6 g / cm^3

V = 0.97 cm^3

3.  solve for mass

m = V x D

m = 15,000 mL x 3g / mL = 45,000 g

or 50,000 g to one significant digit.

Answer 3

NUMBER 1:

FORMULA of Density: D = m/v

REQUIRED: m

SOLUTION: Re-arrange first the equation to get the m ( mass ).

M = D(V), where 1 cm3 = 1ml

M = (1.05 g/cm3)(45 cm3)

ANSWER: M = 47.25 g

NUMBER 2:

REQUIRED: V

SOLUTION: Re-arrange first the equation to get the V ( Volume ).

V = (M/D), where 1 cm3 = 1ml

V = (3.5g/3.6g/cm3)

ANSWER: V = 0.97 cm3 or 0.97 ml

NUMBER 3:

REQUIRED: m

SOLUTION: Re-arrange first the equation to get the m ( mass ).

M = D(V),

M = (3 g/ml)(15 ml)

ANSWER: M = 45  g

Answer 4

1..M = V x D = 45 cc(mL) x 1.05 g/mL(cc) = 47.25 cc(mL).

2..V = M/D = 3.5 g / 3.6 g/cc = 0.972 cc.

3..M = V x D: 15 L = 15,000mL = 15,000 mL x 3 g/mL.

=  45,000 g = 45 kg.

Answer 5

1. ρ = m/V

Multiply both sides by V:

m = ρV = (1.05 g/cm³)(45 cm³) = 47.25 g

*Note: 1 mL = 1 cm³

2. ρ = m/V

Multiply both sides by V/ρ:

V = m/ρ = (3.5 g) / (3.6 g/cm³) = 0.97 cm³

3. 1 L = 1000 mL, so 15 L = 15000 mL

m = ρV = (3 g/mL)(15000 mL) = 45000 g