chemisty help!! asap?

Question

Which measurement is expressed to 4 significant figures?
1 0.00423 kg
24.049 cm
1300 K
82,306 m
62.40 g



Question 2
A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the temperature of the measurement.)
1.992 g/cm3
1.840 g/cm3
1.729 g/cm3
1.598 g/cm3
0.543 g/cm3



Question 3
A dose of medication was prescribed to be 35 microliters. Which of the following expresses that volume in centiliters?
3.5 × 105 cL
3.5 × 104 cL
3.5 cL
3.5 × 10-4 cL
3.5 × 10-3 cL

Answer 1

1 all but 1300 are sig figs
n i dont feel like doing the rest i have lots of hw in chemistry too cya

Answer 2

Jules,

the answer to your first one is 62.40

Now please do the rest of your hopmework.