Доказать закон сохранения массы веществ: 1. naoh + hcl → nacl + h2o 2. na2o + 2hcl → 2nacl + h2o 3. na2o + co2 → na2co3 4. 3ca + 2p → ca3p2 5. 4al + 3o2 → 2al2o3 6. 2h2 + o2 → 2h2o 7. 2cu + o2 → 2cuo 8. mgo + so2 → mgso3 9. mgo + so3 → mgso4 10.2p + 3cl2 → 2pcl
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