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3 years ago

What is DNA? Please help me out...if can

Chemistry

1 answer:

ahrayia [7]3 years ago

8 0

Dna is deoxyribonucleic acid. it carries genetic instructions used in growth and development in living organisms.

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What is the electron configuration for magnesium (Mg)?

AveGali [126]

Magnesium has atomic no 12

Electronic configuration given by

1s²2s²2p⁶3s²

[Ne]3s²

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1 year ago

Question 21 of 25

RideAnS [48]

Answer:

Explanation:

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3 years ago

When is an atom least likely to react

KonstantinChe [14]

When the atom is stable

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2 years ago

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How many molecules of ethane are present in 64.28 liters of ethane gas (C2H6) at STP

Rom4ik [11]

Answer : The molecule of ethane present in 64.28 L of ethane gas at STP is, $17.277\times 10^{23}$ molecule.

Solution :

At STP,

22.4 L volume of ethane present in 1 mole of ethane gas

64.28 L volume of ethane present in $\frac{64.28L}{22.4L}\times 1mole=2.869moles$ of ethane gas

And, as we know that

1 mole of ethane molecule contains $6.022\times 10^{23}$ molecules of ethane

2.869 moles of ethane molecule contains $2.869\times 6.022\times 10^{23}=17.277\times 10^{23}$ molecules of ethane

Therefore, the molecule of ethane present in 64.28 L of ethane gas at STP is, $17.277\times 10^{23}$ molecule.

4 0

3 years ago

Read 2 more answers

Portland cement concrete (PCC) has a density of 150 lb/ft3. How many kilograms of PCC are required to cast a cylindrical column

Ksivusya [100]

Answer:

Mass, m = 19466.7 kg

Explanation:

Given that,

Portland cement concrete (PCC) has a density of 150 lb/ft³

We need to find how many kilograms of PCC are required to cast a cylindrical column 1.15 m in diameter and 7.8 m in height.

Since, 1 kg = 2.205 lb

1 lb/ft³ = 16.018 kg/m³

150 lb/ft³ = 2402.77 kg/m³

Density, $d=\dfrac{m}{V}$

m is mass of PCC in kg and V is volume of cylinder

$m=d\times V$

$m=d\times \pi r^2 h\\\\m=2402.77\times \pi \times (1.15/2)^2\times 7.8\\\\m=19466.70\ kg$

So, the mass of PCC required is 19466.7 kg.

5 0

3 years ago