Какую массу щелочи можно получить если подвергнуть электролизу 2 кг. 25% раствора хлорида калия

Употребите глаголы, данные в скобках, в Present, Past или Future Perfect Continuous. 1. I (to study) at the institute for the nearest 5 years. 2. I (to write) this composition since morning. 3. How long you (to sit) for your exam already? 4. Richard (to play) tennis for two hours before he went to work. 5. He (to run) for more than an hour before he caught them. 6. Mary (to read) for an hour before she went to bed. 7. How long he (to gather) these mushrooms? 8. Nora (to work) for this company for nearly 2 years. 9. I (to write) my report since morning until I finish it. 10. He (to drive) for 4 hours before he reached the town.

Вынести множитель из- под знака корня 252

какое количество теплоты потребуется для нагревания 7 л воды, взятой при температуре 15 градусов по цельсию, до температуры кипения&

какова роль дворянства в годы смуты?