4. How many grams are there in 7.5 x 1027 formula units of Sr(OH)2? 5. How many grams are there in 9.30 x 1026 molecules of H2SO4?
PLEASE ANSWER I WILL MARK YOU BRAINLIEST

  4) 1.52 × 10^6 g

  5) 1.51 × 10^5 g

Explanation:

4. There are 121.63 g/mol of Sr(OH)₂, and there are 6.02214·10^23 formula units per mol. Then the number of grams is ...

  (7.5×10^27 formula units) × (121.63 g)/(6.02214×10^23 formula units)

  = 7.5×121.63/6.02214 × 10^4 g

  ≈ 1.52 × 10^6 g

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5. H₂SO₄ has a molar mass of about 98.079 g, so the given quantity has a mass of about ...

  (9.30×10^26 formula units)(98.079 g)/(6.02214×10^23 formula units)

  = 9.30×98.079/6.02214 × 10^3 g

  ≈ 1.51 × 10^5 g

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