0580/43 May/Jun 2025, Question 6: Standard Form
Cambridge IGCSE Mathematics 0580 · Paper 43 (Extended) · Calculator · 2 marks
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The question, in short
Given the mass of one titanium atom as 7.95 × 10⁻²³ grams, work out how many atoms are in 1 kg of titanium, giving the result in standard form.
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Solution · 2 marks
- 11 kg = 1000 g
- 2Number of atoms = 1000 ÷ (7.95 × 10⁻²³)
- 3= 1.2578… × 10²⁵ ≈ 1.26 × 10²⁵
Answer1.26 × 10²⁵ or 1.257 × 10²⁵ to 1.258 × 10²⁵
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