Express the following sum to appropriatenumber of significant figures

1.	Express the following sum to appropriatenumber of significant figures :a. 2.3 x 10 mL +4.22 x 104 mL +9.04 x10 mL + 8.71 x 10 mL;b. 319.5 9 - 20460 g - 0.0639 g - 45.642 9- 4.173 g
Answer» Explanation: a.) $2.3\times 10 mL +4.22\times 104 mL +<klux>9</klux>.04\times 10 mL + 8.71\times 10 mL$ $=639.38\approx 6.39\times 10^{-2}$ In the exact answer we GET 5 SIGNIFICANT figures but we want THREE significant figure in the answer. b.) 319.5 g - 20460 g - 0.0639 g - 45.642 g- 4.173 g $=-20,190.3739\approx -2.0190\times 10^{4}$ In the exact answer we get 9 significant figures but we want five significant figure in the answer.

Express the following sum to appropriatenumber of significant figures :a. 2.3 x 10 mL +4.22 x 104 mL +9.04 x10 mL + 8.71 x 10 mL;b. 319.5 9 - 20460 g - 0.0639 g - 45.642 9- 4.173 g

Answer»

Explanation:

a.) $2.3\times 10 mL +4.22\times 104 mL +<klux>9</klux>.04\times 10 mL + 8.71\times 10 mL$

$=639.38\approx 6.39\times 10^{-2}$

In the exact answer we GET 5 SIGNIFICANT figures but we want THREE significant figure in the answer.

b.) 319.5 g - 20460 g - 0.0639 g - 45.642 g- 4.173 g

$=-20,190.3739\approx -2.0190\times 10^{4}$

In the exact answer we get 9 significant figures but we want five significant figure in the answer.