Question

Which of the following substances has the lowest density?

A) A mass of 1.5 kg and a volume of 1.2 L
B) A mass of 25 g and a volume of 20 mL
C) A mass of 750 g and a volume of 70 dL
D) A mass of 5 mg and a volume of 25 UL (mcL)

Answer 1

C) A mass of 750 g and a volume of 70 dL .

Step-by-step explanation:

Hello,

In this case, for substantiating the substance having the lowest density we need to compute it in the same units for each case as shown below:

`\rho=(m)/(V)`

A)
`\rho =(1.5kg)/(1.2L)*(1000g)/(1kg) *(1L)/(1000mL)=1.25g/mL`

B)
`\rho =(25g)/(20mL)*=1.25g/mL`

C)
`\rho =(750g)/(70dL)*(10dL)/(1L)*(1L)/(1000mL) =0.107g/mL`

D)
`\rho =(15mg)/(25\mu L)*(1g)/(1000mg) *(1000\mu L)/(1mL)=0.6g/mL`

Therefore, the lowest density corresponds to C) A mass of 750 g and a volume of 70 dL

Regards.