How many moles of MgO are produced when .250 mol of Mg reacts completely with O2

0.250 mol

Explanation:

The reaction between Mg and O2 is given by;

2Mg + O2 --> 2MgO

From the equation above; 2 moles of Mg reacts to form 2 moles of MgO.

0.250 mol of Mg would produce x mol of MgO.

2 = 2

0.250 = x

x = 0.250 * 2/2 = 0.250 mol

sure what is it? ^w^

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.