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3 years ago

Someone please help me i dont understand how too do these

Chemistry

1 answer:

sammy [17]3 years ago

6 0

Answer:

0.55

Explanation:

When multiplying values, the number of significant figures in the answer should be the same as the number with the lowest sig figs in the problem which in this case is 2 sig figs (0.17)

3.22 * 0.17 = .5474

Rounded to 2 sig figs = 0.55

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Match the SI unit to the quantity it measures. second gram kelvin mole ampere meter candela kilogram nanosecond mass arrowRight

Gemiola [76]

SI unit- Quantity

second- time

kilogram- mass

kelvin- temperature

ampere- electric current

S.I. Unit of time is second.

S.I. Unit of mass is kilogram.

S.I. Unit of temperature is kelvin.

S.I. Unit of electric current is ampere.

So match will be as follows:

second- time

kilogram- mass

kelvin- temperature

ampere- electric current

8 0

3 years ago

Carbon disulfide burns in oxygen to yield carbon dioxide and sulfur dioxide according to the following chemical equation. CS2(l)

Semmy [17]

Answer:

a) the limiting reactant is 02

b) There will remain 0.667 moles of CS2

c) There will be formed 0.333 moles oof CO2 and 0.667 moles of SO2

Explanation:

Step 1: Data given

Number of moles of CS2 = 1.00 mol

Number of moles of O2 = 1.00 mol

Molar mass of O2 = 32 g/mol

Molar mass of CS2 = 76.14 g/mol

Step 2: The balanced equation

CS2(l) + 3O2(g) → CO2(g) + 2SO2(g)

Step 3: Calculate the limiting reactant

For 1 mole of CS2 we need 3 moles of O2 to produce 1 mol of CO2 and 2 moles of SO2

O2 is the limiting reactant. It will completely be consumed.(1.00 mol).

CS2 is in excess. There will react 1.00/ 3 = 0.333 moles

There will remain 1.00 - 0.333 = 0.667 moles of CS2

Step 4: Calculate moles of CO2 and SO2

For 1 mole of CS2 we need 3 moles of O2 to produce 1 mol of CO2 and 2 moles of SO2

For 1.00 mol of O2 we have 1.00/3 = 0.333 moles CO2

For 1.00 mol of O2 we have 1.00 /(3/2) = 0.667 moles of SO2

8 0

3 years ago

When the same or different atoms combine together, you have a:

Alex73 [517]

Answer:

D.) molecule

<h3>When the same or different atoms combine together they for a molecule</h3>

3 0

3 years ago

How many electrons, protons and neutrons are in the element tin

lisabon 2012 [21]

Answer: Tin has 48 electrons, 69 neutrons, and 50 protons.

Explanation:

4 0

3 years ago

A sample weighing 3.110 g is a mixture of Fe 2 O 3 (molar mass = 159.69 g/mol) and Al 2 O 3 (molar mass = 101.96 g/mol). When he

grandymaker [24]

Answer:

The mass fraction of ferric oxide in the original sample : $\frac{723}{3110}$

Explanation:

Mass of the mixture = 3.110 g

Mass of $Fe_2O_3=x$

Mass of $Al_2O_3=y$

After heating the mixture it allowed to react with hydrogen gas in which all the ferric oxide reacted to form metallic iron and water vapors where as aluminum oxide did not react.

$Fe_2O_3(s)+3H_2(g)\rightarrow 2Fe(s)+3H_2O(g)$

Mass of mixture left after all the ferric oxide has reacted = 2.387 g

Mass of mixture left after all the ferric oxide has reacted = y

$x=3.110 g- y=3.110 g - 2.387 g = 0.723 g$

The mass fraction of ferric oxide in the original sample :

$\frac{0.723 g}{3.110 g}=\frac{723}{3110}$

5 0

3 years ago

Someone please help me i dont understand how too do these​

Someone please help me i dont understand how too do these