Consider the following reaction.

2Fe2O3(s)+3C(s)heat−−→4Fe(s)+3CO2(g)Calculate the number of grams of Fe2O3 needed to react with 20.0 g C.

Small quantities of oxygen can be prepared in the laboratory by heating potassium chlorate, KClO3(s).

The equation for the reaction is2KClO3⟶2KCl+3O2Calculate how many grams of O2(g) can be produced from heating 19.1 g KClO3(s).

Consider the combustion reaction for octane (C8H18) , which is a primary component of gasoline.

2C8H18+25O2⟶16CO2+18H2OHow many moles of CO2 are emitted into the atmosphere when 19.6 g C8H18 is burned?

Determine P(5 ≤ X ≤ 8)

Determine P(5 ≤ X < 8)

Translating inequalities

The difference of 8 and six times a number is a minimum of sixty-eight

How do you get All Four Points on your English SAT?

How do you get All Four Points on your English SAT?


Suppose you bet $1 on red at the roulette wheel. There are 18 red numbers and 20 nonred numbers (including the green 0 and 00). You win $1 if a red number comes up, and you lose $1 if any other... more

trig need help, with one last equation in my problem

If sinx=49, x in quadrant I, then find (without finding x)sin(2x)= 2(4/9)(sqrt(65)/9)cos(2x)= 1-2(4/9)^2tan(2x) = ?

Find the average rate of change of the function over the given interval.

f(t) = 4t2 − 5,      [3, 3.1]Compare this average rate of change with the instantaneous rates of change at the endpoints of the interval.left endpoint:right endpoint:

Find k such that the line is tangent to the graph of the function.

Function: f(x)= kx Line: y=4x+4

Find the probability

There are 25 red marbles, 15 green marbles, and 10 blue marbles.You randomly pick 4 from the bag.What is the probability of picking at least 1 marble of each color?

Geometry Homework

Important!With the following points: E(-3,5),F(6,2),G(4,-4), H(-5,-1)Find the perimeter and area of rectangle EFGH.

Angle measurements

Complimentary Angles= 90 degreesSupplementary Angles= 180Congruent Angles= both measure the sameVertical Angles= ?Adjacent Angles= ?Could you please answer my question marks?


5 is 5% of what number?

How to write Z over 8 -9 as a word phrase

How to write 49 + m as a word phrase

find the missing number to complete the porportion

4 apartments on 1 floor=_______ Apartments on 5 floors


(solve a system of equations)

There are 26 students in Mrs.Anderson's class. there are two more boys than girls. How many of each are in Mrs.Anderson's class

How long till the ball reaches its highest point

An elementary student kicks a ball straight into the air with a velocity of 16 feet/sec. If acceleration due to gravity is -32 ft/sec2, how many seconds after it leaves his foot will it take the... more

Find the displacement

For an object whose velocity in ft/sec is given by v(t) = -t2 + 4, what is its displacement, in feet, on the interval t = 0 to t = 3 secs?Question... more

Find the distance

Find the distance, in feet, a particle travels in its first 4 seconds of travel, if it moves according to the velocity equation v(t)= -t2 + 4 (in feet/sec). Question... more
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