3 years ago

What would be the MOLARITY (M) of the NaBr in the same buffer solution, if its concentration is now 0.9% (w/v)?

1 answer:

6 0

If by buffer solution you mean, a solution of the same concentration, the molarity (M) would stay the same. You would just have a greater volume.

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If 3 g of element C combine with 8 g of element D to form compound CD, how many grams of D are needed to form compound CD2?

bija089 [108]

For the answer to the question above,
If 3g of element combines with 8g of D to form CD it means
1 mole of C = 3g
1 mole of D = 8g
hence it forms CD.
So to form CD2 you need 16g of element D
I hope my answer helped you

8 0

3 years ago

What type of reaction is this? 2Na(s) + Cl2(g) —> 2NaCl(s)

soldier1979 [14.2K]

Answer: Synthesis

Explanation:

2 or more substances combine to form a new compound. In this case 2Na(s) combined with Cl2(g) to make 2NaCl(s)

A + X ---> AX

7 0

3 years ago

How many moles of Ar gas are present in a container with a volume of 78.4 L at STP?

rusak2 [61]

<h3>Answer:</h3>

1 mole of a gas at STP occupies 22.4 L volume 

Now the volume is given =78.4 therefore,

No. of moles of gas = 78.4 ÷ 22.4 = 3.5 moles

I hope it helps you~

7 0

2 years ago

If a substance changes from one phase to another, is it still same substance? why

shutvik [7]

When you boil water, you aren't changing the elements. You're just making water vapor. However, when you burn paper, it becomes carbon (mostly). So physical changes will not change the substance, only chemical changes will.

5 0

3 years ago

What does it mean when your teacher wants you to round 143 to two significant figures

zhenek [66]

Answer:The answer is 3...I think

Explanation:

143

Sig Figs

Decimals

Scientific Notation

1.43 × 102

5 0

3 years ago