Ask question

Ask question

All categories

3 years ago

12

Complete the following math problem and round your answer to the correct number of significant figures. Explain why your answer

has that number of decimal places or significant figures.
12.65 + 11.2

1 answer:

BigorU [14]3 years ago

7 0

Answer:

file link http/www.openfree

You might be interested in

Which element in the alkali group will have the lowest first ionization energy?

Morgarella [4.7K]

Fluorine

Explanation:

F- has the lowest ionisation energy

8 0

3 years ago

Calculate the number of pounds of CO2 released into the atmosphere when a 17.0-gallon tank of gasoline is burned in an automobil

rosijanka [135]

I have no clue at all hope someone can help u

8 0

3 years ago

Which statement defines calorimetry

m_a_m_a [10]

I can't answer the question without the statements but I can tell you Calorimetry means measuring amounts of heat released or received during a chemical reaction.

7 0

3 years ago

Read 2 more answers

A 5.00 gram sample of an oxide of lead PbxOy contains 4.33 g of lead. Determine simplest formula for the compund

Harrizon [31]

Answer: The empirical formula is $PbO_2$

Explanation:

Mass of Pb = 4.33 g

Mass of O = (5.00-4.33) g = 0.67 g

Step 1 : convert given masses into moles

Moles of Pb = $\frac{\text{ given mass of Pb}}{\text{ molar mass of Pb}}= \frac{4.33g}{207g/mole}=0.021moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{0.67g}{16g/mole}=0.042moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Pb = $\frac{0.021}{0.021}=1$

For O = $\frac{0.042}{0.021}=2$

The ratio of Pb O= 1: 2

Hence the empirical formula is $PbO_2$

6 0

3 years ago

A solution of the weak acid HF and a solution of the strong acid HCl have the same pH. Which solution will require the most sodi

Karo-lina-s [1.5K]

Explanation:

I think at HF is the answer because the pH value of weak acid are 4 and 5

please mark the brainliest if you are satisfied thank you very much

5 0

3 years ago