Solve the following question: Round off the following quantity to three significant figures: 643 cm2 - Chemistry

Solve the following question:

Round off the following quantity to three significant figures:

643 cm²

Numerical

643 cm² (or 6.43 × 10² cm²)

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Chapter 2: Introduction to Analytical Chemistry - Exercises [Page 24]

Chapter 2 Introduction to Analytical Chemistry
Exercises | Q 3. (C)(c) | Page 24

Choose the correct option:

In Avogadro’s constant 6.022 × 10²³ mol^-1, the number of significant figures is ________

What do you mean by significant figures?

Solve the following question:

Round off the following quantity to two significant figures:

25.55 mL

Solve the following question:

Round off the following quantity to three significant figures:

79,000 m

Solve the following question:

Round off the following quantity to three significant figures:

42,150

Solve the following question:

Round off the following quantity to three significant figures:

649.85

Express the following sum to the appropriate number of significant figures:

2.3 × 10³ mL + 4.22 × 10⁴mL + 9.04 × 10³ mL + 8.71 × 10⁵ mL

Solve the following question:

Express the following sum to the appropriate number of significant figures:

319.5 g − 20460 g − 0.0639 g − 45.642 g − 4.173 g