A compound contains 70.18 % oxygen by mass. What mass of this compound would be needed to obtain 48.45 grams of oxygen?

Answers

Answer 1

Answer:

Answer:

69.036 g of Compound is required to obtain 48.45 g of Oxygen.

Explanation:

Let us assume that the total mass of the compound is 100 g. So it means that this compound weighing 100 is composed 70.18 % of Oxygen or among 100 g of this compound 70.18 g is constituted by oxygen only. Hence, we can make a relation as that,

70.18 g O is present in = 100 g of a Compound

So,

48.45 g of O will be present in = X g of a Compound

Solving for X,

X = 100 g × 48.45 g ÷ 70.18 g

X = 69.036 g of Compound

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Which type of change does not break or form bonds? A.physical B. Chemical change C. Nuclear change D. Molecular change

Answers

It is a physical change.

i think phyisical although i may be wrong

Assume that each tablet's mass was 1,000 mg, and remember that you used 0.200 L of water each time. Compute the reaction rate to the nearest whole number using the formula below.

Answers

Answer:

For every temperature you use the formula given by the question.

at 3°C you have:

Reaction rate = (1000/0.2)/138.5 = 36 mg/L/sec

at 24°C you have:

Reaction rate = (1000/0.2)/34.2 = 146 mg/L/sec

at 40°C you have:

Reaction rate = (1000/0.2)/26.3 = 190 mg/L/sec

at 65°C you have:

Reaction rate = (1000/0.2)/14.2 = 352 mg/L/sec

Explanation:

Answer:

see below

Explanation:

3°C: 36

24°C: 146

40°C: 190

65°C: 352

Full table: 145

Eight pieces: 173

Tiny pieces: 216

Which atomic number corresponds to the element which is most stable?1
3
8
16
36

Answers

Answer:

Explanation:

Hope this helps

PLEASE MARK AS BRAINLIEST !!!!

Answer:

Explanation:

This is a simple answer, but I assure you that it is 100% correct.

Hope this helps you.

What information does a food web reveal that a food chain does not? A. A food web shows the actual number of joules of energy that is transferred from one trophic level to another but a food chain never does. B. A food web shows that most organisms consume and are consumed by more than one organism. C. A food web only shows a single pathway of consumption through the ecosystem. D. A food web consists of biomass pyramids but a food chain does not.

Answers

B because food web show when grass is consumed cows and horses both eat same thing with other food sources

if 20.0g of N2 gas has a volume of 0.40L and a pressure of 6.0atm, what is the temperature in degrees celsius?

Answers

Answer:

-232 °C

Explanation:

We can use the Ideal Gas Law and solve for T.

pV = nRT

Data:

m = 20.0 g

p = 6.0 atm

V = 0.40 L

R = 0.082 06 L·atm·K⁻¹mol⁻¹

Calculations:

1. Moles of N₂

$\text{n} = \text{20.0 g} * \frac{\text{1 mol}}{\text{28.01 g}} = \text{0.7140 mol}$

2. Temperature of N₂

$\begin{array} {rcl}pV & = & nRT\n\text{6.0 atm} * \text{0.40 L} & = & \rm\text{0.7140 mol} * 0.08206 \text{ L}\cdot\text{atm}\cdot\text{K}^(-1)\text{mol}^(-1) * T\n2.40&=&0.05859T\text{ K}^(-1)\nT& =& \frac{2.40 }{0.05859\text{ K}^(-1)}\n\n & = & \text{41.0 K}\end{array}$

3. Convert the temperature to Celsius

T = (41.0 - 273.15) °C = -232 °C

How is groundwater formed?

Answers

Groundwater is formed in one of several ways. It can trickle down through the sand and rock from the rain and other types of precipitation. Groundwater can also come from underground streams or rivers or even from the aquifer that is located beneath the rocks under the ground. This water has existed from the beginning of time and moves through a cycle. It evaporates, becomes rain, falls back to the Earth, and then continues into the ground.

Groundwater is formed when water percolates down through the soil.

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