A 12. 2 g sample of X reacts with a sample of Y to form 78.9 g of XY. What is the mass of Y that reacted?

Answer 1

#"Mass"# #=# #78.0*g-12.2*g=?#

What does it mean to say that all chemical reactions CONSERVE mass?

It means that if I start with #10 *g# of reactants, from all source, AT MOST I can get #10*g# of product.
#"Garbage in equals Garbage out!"#
Here I finished with a #78.9*g# mass of #XY#. There were #12.2*g# of #X#. And the balance must represent the mass of #Y#.
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Answer 2

To find the mass of Y that reacted, subtract the mass of X from the total mass of XY: Mass of Y = Mass of XY - Mass of X Mass of Y = 78.9 g - 12.2 g Mass of Y = 66.7 g

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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