¿cual es la iluminacion medida en lux que produce un foco de 60 wattas sobre una mesa hallada a 2 m de distancia ?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.

The rules of engagement (roe) working group is often used to (select all that apply.)