the recommended daily allowance of calcium is 1.2 g. calcium carbonate contains 12.0 % calcium by mass. how many grams of calcium carbonate are needed to provide the rda of calcium

I have news for you. CaCO3 is 40% by mass Ca and not 12.0%. (Actually 40.04%).

So if you want 1.2 g you would take
0.40x = 1.2 and x = 1.2/0.4 = 3.0 g CaCO3.

But your problem is worked the same way.
0.12x = 1.2 and x = 10 g. Check your figures. I can assure that CaCO3 is 40% Ca and not 12%.

Well, to calculate that, we need to do some good old-fashioned math. Don't worry, I won't make you do it yourself. Calcium carbonate contains 12.0% calcium by mass, so we can find the amount of calcium in 1 gram of calcium carbonate by multiplying it by 0.12 (12.0%).

Now, to find the number of grams of calcium carbonate needed to provide the RDA of calcium (1.2 g), we just need to divide 1.2 g by the amount of calcium in 1 gram of calcium carbonate (which we calculated earlier).

But hey, since we're talking about calcium here, I can't resist making a cheesy joke. Why did the calcium go to therapy? Because it had low self-Esteem. Get it? Esteeeeem? Calcium carbonate? Okay, enough of my clowning around, let's do the math.

1.2 g / (0.12 g/g) = 10 g

So, you would need approximately 10 grams of calcium carbonate to provide the RDA of calcium.

To find out how many grams of calcium carbonate are needed to provide the recommended daily allowance (RDA) of calcium, we can follow these steps:

Step 1: Calculate the RDA of calcium in grams.
The RDA of calcium is given as 1.2 g.

Step 2: Calculate the mass of calcium carbonate needed.
Calcium carbonate contains 12.0% calcium by mass. This means that for every 100 grams of calcium carbonate, there is 12 grams of calcium.

Let "x" be the mass of calcium carbonate needed in grams.
Given that 12 grams of calcium is equivalent to 100 grams of calcium carbonate, we can set up a proportion:

12 grams / 100 grams = 1.2 grams / x grams

Simplifying the proportion:

12/100 = 1.2/x

Cross-multiplying:
12x = (100)(1.2)

12x = 120

Dividing both sides by 12:
x = 10

Therefore, you would need 10 grams of calcium carbonate to provide the RDA of calcium.

To find out how many grams of calcium carbonate are needed to provide the Recommended Daily Allowance (RDA) of calcium, we can use the following steps:

Step 1: Determine the RDA of calcium in grams.
The RDA of calcium is given as 1.2 g.

Step 2: Find the mass of calcium in calcium carbonate.
Calcium carbonate contains 12.0% calcium by mass.
This means that there are 12.0 g of calcium in every 100 g of calcium carbonate.

Step 3: Calculate the mass of calcium carbonate needed.
To find the mass of calcium carbonate needed, we can set up a proportion using the ratio of calcium to calcium carbonate:

Calcium/Calcium carbonate = RDA of calcium/Mass of calcium carbonate

Substituting the known values:
12.0 g/100 g = 1.2 g/x (where x is the mass of calcium carbonate needed)

Cross-multiplying and solving for x:
12.0 g * x = 1.2 g * 100 g
12.0x = 120 g
x = 120 g / 12.0
x = 10 g

Therefore, you will need 10 grams of calcium carbonate to provide the RDA of calcium.