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10 problems counting atoms in formulas. P1: 'H₂O: H=___, O=___' (2, 1). P2: 'CO₂: C=___, O=___' (1, 2). P3: 'H₂SO₄: H=___, S=___, O=___' (2, 1, 4). P4: 'Ca(OH)₂: Ca=___, O=___, H=___' (1, 2, 2). P5: 'Al₂O₃: Al=___, O=___' (2, 3). P6: '2H₂O: H=___, O=___' (4, 2 - coefficient!). P7: '3CO₂: C=___, O=__

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