The visible universe is estimated to contain 10²² stars. How many moles of stars are present in the visible universe?

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A compound was found to contain carbon and hydrogen in the ratio of carbon 12 g and hydrogen 4 g. What is the formula of the compound?

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The mass of one steel screw is 4.11g. Find the mass of one mole of these steel screws. Compare this value with the mass of the Earth (5.98 × 10²⁴kg). Which one of the two is heavier and by how many times?

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